Monday, 17 April 2017
A C database that uses a dynamic array
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<malloc.h>
typedef struct addr_list{
char name[40];
char street[40];
char district[40];
char town[40];
char county[40];
char country[40];
char postcode[40];
char telno[40];
char email[40];
}addr_list;
int counter;
struct addr_list **recordarray;
struct addr_list ***pointer = &recordarray;
void readLine(char buffer[]);
void enter(void), txtoutput(void), list(void);
void delete(void);
void load(void), save(void);
void swap(int u, int v), sort(void), search(void);
void endprog(void);
int main(void)
{
int choice;
char s[80];
counter = 0;
struct addr_list **recordarray = calloc(counter, sizeof(struct addr_list *));
for(;;) {
printf("\n");
printf("1. Create a record\n");
printf("2. Delete a record\n");
printf("3. List the file\n");
printf("4. Save the file\n");
printf("5. Load the file\n");
printf("6. Sort the file\n");
printf("7. Search\n");
printf("8. Output to a text file for printing or import into wp\n");
printf("9. Quit\n");
printf("\n");
do {
printf("\nEnter your choice: ");
readLine(s);
choice=atoi(s);
}while(choice < 0 && choice > 11);
switch(choice) {
case 1: enter();
break;
case 2: delete();
break;
case 3: list();
break;
case 4: save();
break;
case 5: load();
break;
case 6: sort();
break;
case 7: search();
break;
case 8: txtoutput();
break;
case 9: endprog();
}
}
return 0;
}
void enter(void)
{
int i;
counter = counter + 1;
i =counter;
recordarray = realloc(* pointer, counter * sizeof(struct addr_list));
recordarray[i] = malloc(sizeof(addr_list));
if(!recordarray[i])
{
printf("Memory request failed\n");
return;
}
printf("Enter information on new customer\n");
printf("Enter name: ");
readLine(recordarray[i]->name);
printf("Enter street: ");
readLine(recordarray[i]->street);
printf("Enter district / parish: ");
readLine(recordarray[i]->district);
printf("Enter town / city: ");
readLine(recordarray[i]->town);
printf("Enter county: ");
readLine(recordarray[i]->county);
printf("Enter country: ");
readLine(recordarray[i]->country);
printf("Enter postcode: ");
readLine(recordarray[i]->postcode);
printf("Enter telephone number: ");
readLine(recordarray[i]->telno);
printf("Enter email address: ");
readLine(recordarray[i]->email);
printf("\nMemory at %i bytes after reading.\n", counter * sizeof(**recordarray));
}
void delete(void)
{
int t;
int u;
printf("\nenter a record number #: ");
scanf("%i", &t);
getchar();
for(u=t; u<=counter; u++){
recordarray[u] = recordarray[u+1];
}
counter = counter -1;
recordarray = realloc(* pointer, counter * sizeof(struct addr_list));
printf("\nRecord number %i deleted.\n",t);
printf("\nMemory at %i bytes after deletion.\n", counter * sizeof(**recordarray));
}
void list(void)
{
register int t;
int count;
count = 0;
for(t=1; t<=counter; t++)
{
count = count + 1;
printf("Record number: %i\n",count);
printf("%s\n", (*pointer)[t]->name);
printf("%s\n", (*pointer)[t]->street);
printf("%s\n", (*pointer)[t]->district);
printf("%s\n", (*pointer)[t]->town);
printf("%s\n", (*pointer)[t]->county);
printf("%s\n", (*pointer)[t]->country);
printf("%s\n", (*pointer)[t]->postcode);
printf("%s\n", (*pointer)[t]->telno);
printf("%s\n", (*pointer)[t]->email);
printf("\n");
}
}
void sort(void)
{
register int u;
register int v;
for(u=1; u<counter; u++)
for (v=u+1; v<=counter; v++){
if( strcmp(recordarray[u]->name, recordarray[v]->name) >0){
swap(u, v);
}
}
printf("\nRecords sorted.\n");
}
void swap(int u, int v)
{
struct addr_list *temp;
temp = recordarray[u];
recordarray[u] = recordarray[v];
recordarray[v] = temp;
}
void save(void)
{
FILE *file1;
FILE *fp;
register int i;
if((file1=fopen("filesize", "w"))==NULL) {
printf("Cannot open file.\n");
return;
}
fprintf(file1,"%d\n",counter);
fclose(file1);
if((fp=fopen("maillist", "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
for(i=1; i<=counter; i++)
if(recordarray[i]->name)
if(fwrite((*pointer)[i], sizeof(addr_list), 1, fp)!=1)
{
printf("File write error.\n");
fclose(fp);
return;
}
printf("\n%i records saved to file.\n", counter);
fclose(fp);
}
void load(void)
{
FILE *fp;
FILE *file1;
register int i;
if((file1=fopen("filesize", "r"))==NULL) {
printf("Cannot open file,\n");
return;
}
fscanf(file1,"%i", &counter);
fclose(file1);
if((fp=fopen("maillist", "rb"))==NULL) {
printf("Cannot open file.\n");
counter = 0;
return;
}
recordarray = realloc(* pointer, counter * sizeof(addr_list));
for(i=1; i<=counter; i++){
recordarray[i] = malloc(sizeof(addr_list));
if(!recordarray[i])
{
printf("Out of memory.\n");
return;
}
if(fread((*pointer)[i], sizeof(addr_list), 1, fp)!=1) {
printf("File read error.\n");
fclose(fp);
return;
}
}
printf("\n%i records loaded.\n",counter);
printf("\nMemory at %i bytes after reading.\n", counter * sizeof(**recordarray));
fclose(fp);
}
void txtoutput(void)
{
int t;
int count;
FILE *stream;
char filename[30];
count = 0;
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
stream = fopen(filename, "w+");
for(t=1; t<=counter; t++) {
if((*pointer)[t]->name[0]) {
count = count +1;
fprintf(stream,"%i\n",count);
fprintf(stream,"%s\n", (*pointer)[t]->name);
fprintf(stream,"%s\n", (*pointer)[t]->street);
fprintf(stream,"%s\n", (*pointer)[t]->district);
fprintf(stream,"%s\n", (*pointer)[t]->town);
fprintf(stream,"%s\n", (*pointer)[t]->county);
fprintf(stream,"%s\n", (*pointer)[t]->country);
fprintf(stream,"%s\n", (*pointer)[t]->postcode);
fprintf(stream,"%s\n", (*pointer)[t]->telno);
fprintf(stream,"%s\n", (*pointer)[t]->email);
fprintf(stream,"\n");
}
}
fclose(stream);
return;
}
void search(void)
{
int i;
int count;
int flag = 0;
char s[40];
count=0;
printf("\nEnter a name.\n");
readLine(s);
for(i=1;i<=counter;i++)
{
if(recordarray[i]->name[0]) {
count = count +1;
}
if (strcmp(s, recordarray[i]->name)==0)
{
flag = 1;
printf("\nRecord number: %i\n", count);
printf("\nName: %s\n",(*pointer)[i]->name);
printf("\nStreet: %s\n",(*pointer)[i]->street);
printf("\nDistrict: %s\n",(*pointer)[i]->district);
printf("\nTown: %s\n",(*pointer)[i]->town);
printf("\nCounty: %s\n",(*pointer)[i]->county);
printf("\nCountry: %s\n",(*pointer)[i]->country);
printf("\nPostcode:%s\n",(*pointer)[i]->postcode);
printf("\nTelephone number: %s\n",(*pointer)[i]->telno);
printf("\nEmail address: %s\n",(*pointer)[i]->email);
printf("\n");
}
}
if(flag == 0) printf("Record not found.\n");
}
void readLine(char buffer[])
{
char character;
int i=0;
do
{
character=getchar();
buffer[i]=character;
++i;
}
while(character !='\n');
buffer[i-1]='\0';
}
void endprog(void)
{
free(*pointer);
exit(0);
}
Tuesday, 4 April 2017
A C database that uses random access files
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
#include<stdbool.h>
struct contactinfo{
char name[40];
char number[40];
char email[40];
};
struct filedetails{
int filelength;
int recnum;
};
struct filedetails filespec;
struct contactinfo person;
struct contactinfo blankfields;
FILE *details;
int flag = 0;
char contact[40];
long int offset=0, length;
long int size;
char filename[30];
bool recordfound;
void newsubs(void), search(void), readLine(char buffer[]), new(void), sort(void);
void list(void), delete(void), prntxt(void);
int main(void)
{
int choice;
char ch[3];
for(;;){
printf("\n");
printf("1. New file\n");
printf("2. New record\n");
printf("3. Sort\n");
printf("4. List\n");
printf("5. Search\n");
printf("6. Delete\n");
printf("7. Export to a txt file for printing.\n");
printf("8. Quit:\n");
do{
printf("\nChoose...");
readLine(ch);
choice = atoi(ch);
if(choice==1)new();
if(choice==2)newsubs();
if(choice==3)sort();
if(choice==4)list();
if(choice==5)search();
if(choice==6)delete();
if(choice==7) prntxt();
if(choice==8) exit(0);
}while(choice < 1 && choice > 8);
}
return 0;
}
void readLine(char buffer[])
{
char character;
int i=0;
do
{
character=getchar();
buffer[i]=character;
++i;
}
while(character !='\n');
buffer[i-1]='\0';
}
void newsubs()
{
printf("Enter a file name.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "r+b"))==NULL)
{
printf("Cannot open file.\n");
}
if((details=fopen(filename, "r+b"))!=NULL) {
fread(&filespec , sizeof(struct filedetails), 1,details);
printf("Records in file =%d\n",filespec.recnum);
printf("Size of file in bytes = %d\n",filespec.filelength);
printf("Enter information on new contact.\n");
printf("Name:\n");
readLine(person.name);
printf("Phone number:\n");
readLine(person.number);
printf("Email:\n");
readLine(person.email);
size = sizeof(struct contactinfo);
offset=(filespec.recnum +1)*size;
if(fseek(details, offset,0))
printf("Seek error.\n");
length = ftell(details);
printf("Pointer before writing at %ld\n",length);
if(fwrite(&person, sizeof(struct contactinfo), 1,details)==0) {
printf("Write error.");
}
else
{
length = ftell(details);
printf("Pointer after writing at %ld\n",length);
filespec.filelength= length;
filespec.recnum+=1;
rewind(details);
fwrite(&filespec, sizeof(struct filedetails), 1,details);
person = blankfields;
fclose(details);
}
}
}
void search()
{
int searchcount=0;
printf("Enter a file name.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "r+b"))==NULL) {
printf("Cannot open file.\n");
}
else
{
if((details=fopen(filename, "r+b"))!=NULL)
flag = 0;
recordfound=0;
fread(&filespec , sizeof(struct filedetails), 1,details);
printf("Enter a name to look for.\n");
readLine(contact);
offset=0;
while(!feof(details))
{
searchcount+=1;
size = sizeof(struct contactinfo);
offset+=size;
if(fseek(details, offset,0)){
printf("Seek error.");
}
else
{
fread(&person, sizeof(struct contactinfo), 1, details);
if(strcmp(contact, person.name)==0)
{
recordfound=1;
printf("%s\n",person.name);
printf("%s\n",person.number);
printf("%s\n",person.email);
printf("\n");
}
if(searchcount == filespec.recnum)break;
}
}
fclose(details);
if(recordfound == 0)
{
printf("Record not found.\n");
}
else
{
if(recordfound == 1) recordfound== 0;
flag = 1;
}
}
}
void new()
{
printf("Enter a file name.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "w+b"))==NULL) {
printf("Cannot open file.\n");
}
filespec.recnum=0;
fwrite(&filespec , sizeof(struct filedetails), 1,details);
printf("New file created\n");
fclose(details);
}
void sort()
{
int recnum;
int i;
struct contactinfo temp;
long int u;
long int v;
printf("Enter a file name.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "r+b"))==NULL) {
printf("Cannot open file.\n");
}
else
{
fread(&filespec , sizeof(struct filedetails), 1,details);
for(u=1; u<filespec.recnum; u++)
{
for (v=u+1; v<=filespec.recnum; v++){
size = sizeof(person);
fseek(details, sizeof(person)*u,0);
fread(&person, sizeof(person), 1, details);
fseek(details, sizeof(person)*(v),0);
fread(&temp, sizeof(person), 1, details);
if(strcmp(person.name,temp.name)>0)
{
fseek(details, sizeof(person)*(u),0);
fwrite(&temp, sizeof temp, 1,details);
fseek(details, sizeof(person)*(v),0);
fwrite(&person, sizeof(person), 1,details);
}
}
}
fclose(details);
}
}
void list()
{
int counter = 0;
printf("Enter a file name.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "r+b"))==NULL) {
printf("Cannot open file.\n");
}
if((details=fopen(filename, "r+b"))!=NULL) {
fread(&filespec , sizeof(struct filedetails), 1,details);
printf("Records in file =%d\n",filespec.recnum);
printf("Size of file in bytes =%d\n", filespec.filelength);
size = sizeof(struct contactinfo);
offset=0;
while(!feof(details))
{
counter +=1;
offset+=size;
if(fseek(details, offset,0)){
printf("Seek error.");
}
else
{
fread(&person, sizeof(struct contactinfo), 1, details);
printf("\n");
printf("%s\n",person.name);
printf("%s\n",person.number);
printf("%s\n",person.email);
printf("\n");
if(counter == filespec.recnum)break;
}
}
fclose(details);
}
}
void delete()
{
long int offset2=0;
int recordcount;
int counter=0;
int counter2=0;
char filename2[30];
char reply;
FILE *tempfile;
search();
if(flag == 0)
{
printf("Exiting function delete.\n");
}
else
{
if((details=fopen(filename, "r+b"))==NULL)
{
printf("Cannot open file.\n");
}
else
{
if((details=fopen(filename, "r+b"))!=NULL) {
fread(&filespec , sizeof(struct filedetails), 1,details);
recordcount = filespec.recnum;
printf("Enter a file name for the destination of the edited files.\n");
readLine(filename2);
if((tempfile=fopen(filename2, "w+b"))==NULL)
{
printf("Cannot open file.\n");
}
else
{
filespec.recnum=0;
fwrite(&filespec , sizeof(struct filedetails), 1,tempfile);
printf("New file created\n");
fclose(tempfile);
if((tempfile=fopen(filename2, "r+b"))!=NULL)
{
printf("File %s is open for input.\n",filename2);
}
size = sizeof(struct contactinfo);
offset=0;
while(!feof(details))
{
person = blankfields;
counter +=1;
offset+=size;
if(fseek(details, offset,0)){
printf("Seek error.");
}
else
{
fread(&person, sizeof(struct contactinfo), 1, details);
printf("%s\n",person.name);
if(strcmp(contact, person.name)!=0)
{
counter2+=1;
if(counter2 == recordcount) break;
offset2=(counter2)*size;
if(fseek(tempfile, offset2,0)){
printf("Seek error.");
}
else
{
if(fwrite(&person, sizeof(struct contactinfo), 1, tempfile));
length = ftell(tempfile);
}
}
}
}
fclose(details);
filespec.recnum=counter2-1;
filespec.filelength=length;
rewind(tempfile);
fwrite(&filespec , sizeof(struct filedetails), 1,tempfile);
fclose(tempfile);
}
}
}
}
}
void prntxt()
{
int count;
FILE *stream;
char filenametxt[30];
count = 0;
printf("Enter a 'filename.txt' file name to create and write to.\n");
readLine(filenametxt);
printf("\n");
stream = fopen(filenametxt, "w+");
if((details=fopen(filenametxt, "w+"))==NULL) {
printf("Cannot open file.\n");
}
else
{
int counter = 0;
printf("Enter a file name to read records from.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "r+b"))==NULL) {
printf("Cannot open file.\n");
}
else
{
if((details=fopen(filename, "r+b"))!=NULL) {
fread(&filespec , sizeof(struct filedetails), 1,details);
size = sizeof(struct contactinfo);
offset=0;
while(!feof(details))
{
counter +=1;
count +=1;
offset+=size;
if(fseek(details, offset,0)){
printf("Seek error.");
}
else
{
fread(&person, sizeof(struct contactinfo), 1, details);
fprintf(stream,"%i\n",count);
fprintf(stream,"%s\n", person.name);
fprintf(stream,"%s\n", person.number);
fprintf(stream,"%s\n", person.email);
fprintf(stream,"\n");
if(counter == filespec.recnum)break;
}
}
}
}
}
fclose(details);
fclose(stream);
}
#include<stdlib.h>
#include<string.h>
#include<time.h>
#include<stdbool.h>
struct contactinfo{
char name[40];
char number[40];
char email[40];
};
struct filedetails{
int filelength;
int recnum;
};
struct filedetails filespec;
struct contactinfo person;
struct contactinfo blankfields;
FILE *details;
int flag = 0;
char contact[40];
long int offset=0, length;
long int size;
char filename[30];
bool recordfound;
void newsubs(void), search(void), readLine(char buffer[]), new(void), sort(void);
void list(void), delete(void), prntxt(void);
int main(void)
{
int choice;
char ch[3];
for(;;){
printf("\n");
printf("1. New file\n");
printf("2. New record\n");
printf("3. Sort\n");
printf("4. List\n");
printf("5. Search\n");
printf("6. Delete\n");
printf("7. Export to a txt file for printing.\n");
printf("8. Quit:\n");
do{
printf("\nChoose...");
readLine(ch);
choice = atoi(ch);
if(choice==1)new();
if(choice==2)newsubs();
if(choice==3)sort();
if(choice==4)list();
if(choice==5)search();
if(choice==6)delete();
if(choice==7) prntxt();
if(choice==8) exit(0);
}while(choice < 1 && choice > 8);
}
return 0;
}
void readLine(char buffer[])
{
char character;
int i=0;
do
{
character=getchar();
buffer[i]=character;
++i;
}
while(character !='\n');
buffer[i-1]='\0';
}
void newsubs()
{
printf("Enter a file name.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "r+b"))==NULL)
{
printf("Cannot open file.\n");
}
if((details=fopen(filename, "r+b"))!=NULL) {
fread(&filespec , sizeof(struct filedetails), 1,details);
printf("Records in file =%d\n",filespec.recnum);
printf("Size of file in bytes = %d\n",filespec.filelength);
printf("Enter information on new contact.\n");
printf("Name:\n");
readLine(person.name);
printf("Phone number:\n");
readLine(person.number);
printf("Email:\n");
readLine(person.email);
size = sizeof(struct contactinfo);
offset=(filespec.recnum +1)*size;
if(fseek(details, offset,0))
printf("Seek error.\n");
length = ftell(details);
printf("Pointer before writing at %ld\n",length);
if(fwrite(&person, sizeof(struct contactinfo), 1,details)==0) {
printf("Write error.");
}
else
{
length = ftell(details);
printf("Pointer after writing at %ld\n",length);
filespec.filelength= length;
filespec.recnum+=1;
rewind(details);
fwrite(&filespec, sizeof(struct filedetails), 1,details);
person = blankfields;
fclose(details);
}
}
}
void search()
{
int searchcount=0;
printf("Enter a file name.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "r+b"))==NULL) {
printf("Cannot open file.\n");
}
else
{
if((details=fopen(filename, "r+b"))!=NULL)
flag = 0;
recordfound=0;
fread(&filespec , sizeof(struct filedetails), 1,details);
printf("Enter a name to look for.\n");
readLine(contact);
offset=0;
while(!feof(details))
{
searchcount+=1;
size = sizeof(struct contactinfo);
offset+=size;
if(fseek(details, offset,0)){
printf("Seek error.");
}
else
{
fread(&person, sizeof(struct contactinfo), 1, details);
if(strcmp(contact, person.name)==0)
{
recordfound=1;
printf("%s\n",person.name);
printf("%s\n",person.number);
printf("%s\n",person.email);
printf("\n");
}
if(searchcount == filespec.recnum)break;
}
}
fclose(details);
if(recordfound == 0)
{
printf("Record not found.\n");
}
else
{
if(recordfound == 1) recordfound== 0;
flag = 1;
}
}
}
void new()
{
printf("Enter a file name.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "w+b"))==NULL) {
printf("Cannot open file.\n");
}
filespec.recnum=0;
fwrite(&filespec , sizeof(struct filedetails), 1,details);
printf("New file created\n");
fclose(details);
}
void sort()
{
int recnum;
int i;
struct contactinfo temp;
long int u;
long int v;
printf("Enter a file name.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "r+b"))==NULL) {
printf("Cannot open file.\n");
}
else
{
fread(&filespec , sizeof(struct filedetails), 1,details);
for(u=1; u<filespec.recnum; u++)
{
for (v=u+1; v<=filespec.recnum; v++){
size = sizeof(person);
fseek(details, sizeof(person)*u,0);
fread(&person, sizeof(person), 1, details);
fseek(details, sizeof(person)*(v),0);
fread(&temp, sizeof(person), 1, details);
if(strcmp(person.name,temp.name)>0)
{
fseek(details, sizeof(person)*(u),0);
fwrite(&temp, sizeof temp, 1,details);
fseek(details, sizeof(person)*(v),0);
fwrite(&person, sizeof(person), 1,details);
}
}
}
fclose(details);
}
}
void list()
{
int counter = 0;
printf("Enter a file name.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "r+b"))==NULL) {
printf("Cannot open file.\n");
}
if((details=fopen(filename, "r+b"))!=NULL) {
fread(&filespec , sizeof(struct filedetails), 1,details);
printf("Records in file =%d\n",filespec.recnum);
printf("Size of file in bytes =%d\n", filespec.filelength);
size = sizeof(struct contactinfo);
offset=0;
while(!feof(details))
{
counter +=1;
offset+=size;
if(fseek(details, offset,0)){
printf("Seek error.");
}
else
{
fread(&person, sizeof(struct contactinfo), 1, details);
printf("\n");
printf("%s\n",person.name);
printf("%s\n",person.number);
printf("%s\n",person.email);
printf("\n");
if(counter == filespec.recnum)break;
}
}
fclose(details);
}
}
void delete()
{
long int offset2=0;
int recordcount;
int counter=0;
int counter2=0;
char filename2[30];
char reply;
FILE *tempfile;
search();
if(flag == 0)
{
printf("Exiting function delete.\n");
}
else
{
if((details=fopen(filename, "r+b"))==NULL)
{
printf("Cannot open file.\n");
}
else
{
if((details=fopen(filename, "r+b"))!=NULL) {
fread(&filespec , sizeof(struct filedetails), 1,details);
recordcount = filespec.recnum;
printf("Enter a file name for the destination of the edited files.\n");
readLine(filename2);
if((tempfile=fopen(filename2, "w+b"))==NULL)
{
printf("Cannot open file.\n");
}
else
{
filespec.recnum=0;
fwrite(&filespec , sizeof(struct filedetails), 1,tempfile);
printf("New file created\n");
fclose(tempfile);
if((tempfile=fopen(filename2, "r+b"))!=NULL)
{
printf("File %s is open for input.\n",filename2);
}
size = sizeof(struct contactinfo);
offset=0;
while(!feof(details))
{
person = blankfields;
counter +=1;
offset+=size;
if(fseek(details, offset,0)){
printf("Seek error.");
}
else
{
fread(&person, sizeof(struct contactinfo), 1, details);
printf("%s\n",person.name);
if(strcmp(contact, person.name)!=0)
{
counter2+=1;
if(counter2 == recordcount) break;
offset2=(counter2)*size;
if(fseek(tempfile, offset2,0)){
printf("Seek error.");
}
else
{
if(fwrite(&person, sizeof(struct contactinfo), 1, tempfile));
length = ftell(tempfile);
}
}
}
}
fclose(details);
filespec.recnum=counter2-1;
filespec.filelength=length;
rewind(tempfile);
fwrite(&filespec , sizeof(struct filedetails), 1,tempfile);
fclose(tempfile);
}
}
}
}
}
void prntxt()
{
int count;
FILE *stream;
char filenametxt[30];
count = 0;
printf("Enter a 'filename.txt' file name to create and write to.\n");
readLine(filenametxt);
printf("\n");
stream = fopen(filenametxt, "w+");
if((details=fopen(filenametxt, "w+"))==NULL) {
printf("Cannot open file.\n");
}
else
{
int counter = 0;
printf("Enter a file name to read records from.\n");
readLine(filename);
printf("\n");
if((details=fopen(filename, "r+b"))==NULL) {
printf("Cannot open file.\n");
}
else
{
if((details=fopen(filename, "r+b"))!=NULL) {
fread(&filespec , sizeof(struct filedetails), 1,details);
size = sizeof(struct contactinfo);
offset=0;
while(!feof(details))
{
counter +=1;
count +=1;
offset+=size;
if(fseek(details, offset,0)){
printf("Seek error.");
}
else
{
fread(&person, sizeof(struct contactinfo), 1, details);
fprintf(stream,"%i\n",count);
fprintf(stream,"%s\n", person.name);
fprintf(stream,"%s\n", person.number);
fprintf(stream,"%s\n", person.email);
fprintf(stream,"\n");
if(counter == filespec.recnum)break;
}
}
}
}
}
fclose(details);
fclose(stream);
}
A C database that uses a sorted linked list
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<malloc.h>
struct addr{
char name[40];
char street[40];
char district[40];
char town[40];
char county[40];
char country[40];
char postcode[40];
char telno[40];
char email[40];
struct addr *next;
};
typedef struct addr address;
address *temp, *start, *pointer, *i= NULL;
void list(), add(void), deletion(void), search(void);
void save(), load(void), txtoutput(void), sort(void);
void readLine(char buffer[]);
int main(void)
{
int choice;
for(;;){
printf("\n");
printf("1. Insert a record\n");
printf("2. List the file\n");
printf("3. Delete a record\n");
printf("4. Save the file\n");
printf("5. Save to a text file for output to a wp\n");
printf("6. Search for a record\n");
printf("7. Load the file\n");
printf("8. Quit\n");
do{
printf("\nEnter your choice: ");
scanf("%i",&choice);
getchar();
if(choice==1) add();
if(choice==2) list();
if(choice==3) deletion();
if(choice==4) save();
if(choice==5) txtoutput();
if(choice==6) search();
if(choice==7) load();
if(choice== 8) exit(0);
}while(choice < 1 && choice >8);
}
return 0;
}
void add()
{
address *q;
pointer = (address*) malloc(sizeof(address));
q = (address*) malloc(sizeof(address));
printf("Enter information on new customer\n");
printf("Enter name: ");
readLine(pointer->name);
printf("Enter street: ");
readLine(pointer->street);
printf("Enter district / parish: ");
readLine(pointer->district);
printf("Enter town / city: ");
readLine(pointer->town);
printf("Enter county: ");
readLine(pointer->county);
printf("Enter country: ");
readLine(pointer->country);
printf("Enter postcode: ");
readLine(pointer->postcode);
printf("Enter telephone number: ");
readLine(pointer->telno);
printf("Enter email address: ");
readLine(pointer->email);
if (start == NULL || strcmp(pointer->name, start->name)<0)
{
pointer->next=start;
start=pointer;
}
else
{
q = start;
while(q->next!=NULL && strcmp(q->next->name , pointer->name) < 0)
q=q->next;
pointer->next=q->next;
q->next=pointer;
}
}
void list()
{
if(start==NULL)
printf("No records to view");
/*for (temp=start;temp!=NULL;temp=temp->next)*/
temp = start;
while(temp!=NULL)
{
printf("\n");
printf("%s\n",temp->name);
printf("%s\n",temp->street);
printf("%s\n",temp->district);
printf("%s\n",temp->town);
printf("%s\n",temp->county);
printf("%s\n",temp->country);
printf("%s\n",temp->postcode);
printf("%s\n",temp->telno);
printf("%s\n",temp->email);
printf("\n");
temp=temp->next;
}
}
void readLine(char buffer[])
{
char character;
int i=0;
do
{
character=getchar();
buffer[i]=character;
++i;
}
while(character !='\n');
buffer[i-1]='\0';
}
void save()
{
FILE *fp;
if((fp=fopen("maillist", "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
temp=start;
while(temp){
fwrite(temp,
sizeof(struct addr), 1, fp);
temp = temp->next;
}
fclose(fp);
}
void load()
{
FILE *fp;
if((fp=fopen("maillist", "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}
start = ( address*) malloc(sizeof(address));
/*while(start){
temp=start->next;
free(temp);
start=temp;
}*/
free(start);
start=NULL;
while(!feof(fp)){
i = ( address*) malloc(sizeof(address));
temp = ( address*) malloc(sizeof(address));
if(!i){
printf("Out of memory.\n");
return;
}
if(1!=fread(i,sizeof(struct addr),1,fp))break;
if(start!=NULL)
{
temp = start;
while(temp->next!=NULL)
temp=temp->next;
i->next=NULL;
temp->next=i;
}
else
{
start=i;
i->next=NULL;
}
}
fclose(fp);
}
void txtoutput(void)
{
int t;
int count;
FILE *stream;
char filename[30];
count = 0;
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
stream = fopen(filename, "w+");
temp = start;
while(temp) {
count = count +1;
fprintf(stream,"%i\n",count);
fprintf(stream,"%s\n", temp->name);
fprintf(stream,"%s\n", temp->street);
fprintf(stream,"%s\n", temp->district);
fprintf(stream,"%s\n", temp->town);
fprintf(stream,"%s\n", temp->county);
fprintf(stream,"%s\n", temp->country);
fprintf(stream,"%s\n", temp->postcode);
fprintf(stream,"%s\n", temp->telno);
fprintf(stream,"%s\n", temp->email);
fprintf(stream,"\n");
temp=temp->next;
}
fclose(stream);
return;
}
void search()
{
int flag=0;
char name[40];
printf("Enter name of person to search for\n");
readLine(name);
temp=start;
while(temp)
{
if(strcmp(name, temp->name)==0)
{
printf("%s\n",temp->name);
printf("%s\n",temp->street);
printf("%s\n",temp->district);
printf("%s\n",temp->town);
printf("%s\n",temp->county);
printf("%s\n",temp->country);
printf("%s\n",temp->postcode);
printf("%s\n",temp->telno);
printf("%s\n",temp->email);
flag= 1;
}
temp=temp->next;
}
if(flag==0)
printf("Not found in list\n");
}
void deletion()
{
address *t, *pt;
t = ( address*) malloc(sizeof(address));
pt = ( address*) malloc(sizeof(address));
char name[40];
if(start == NULL)
{
printf("List is empty\n");
return;
}
printf("Enter name of person to be deleted\n");
readLine(name);
if(strcmp(name,start->name)==0)
{
temp=start;
start = start->next;
free(temp);
printf("Record is deleted\n");
return;
}
pt=start;
t=start->next;
while(t!=NULL&& strcmp(t->name,name)!=0)
{
pt =t;
t=t->next;
}
if(t==NULL)
{
printf("Record does not exist\n");
return;
}
if(strcmp(t->name,name)==0)
{
pt->next=t->next;
printf("Record is deleted\n");
free(t);
return;
}
}
#include<stdlib.h>
#include<string.h>
#include<malloc.h>
struct addr{
char name[40];
char street[40];
char district[40];
char town[40];
char county[40];
char country[40];
char postcode[40];
char telno[40];
char email[40];
struct addr *next;
};
typedef struct addr address;
address *temp, *start, *pointer, *i= NULL;
void list(), add(void), deletion(void), search(void);
void save(), load(void), txtoutput(void), sort(void);
void readLine(char buffer[]);
int main(void)
{
int choice;
for(;;){
printf("\n");
printf("1. Insert a record\n");
printf("2. List the file\n");
printf("3. Delete a record\n");
printf("4. Save the file\n");
printf("5. Save to a text file for output to a wp\n");
printf("6. Search for a record\n");
printf("7. Load the file\n");
printf("8. Quit\n");
do{
printf("\nEnter your choice: ");
scanf("%i",&choice);
getchar();
if(choice==1) add();
if(choice==2) list();
if(choice==3) deletion();
if(choice==4) save();
if(choice==5) txtoutput();
if(choice==6) search();
if(choice==7) load();
if(choice== 8) exit(0);
}while(choice < 1 && choice >8);
}
return 0;
}
void add()
{
address *q;
pointer = (address*) malloc(sizeof(address));
q = (address*) malloc(sizeof(address));
printf("Enter information on new customer\n");
printf("Enter name: ");
readLine(pointer->name);
printf("Enter street: ");
readLine(pointer->street);
printf("Enter district / parish: ");
readLine(pointer->district);
printf("Enter town / city: ");
readLine(pointer->town);
printf("Enter county: ");
readLine(pointer->county);
printf("Enter country: ");
readLine(pointer->country);
printf("Enter postcode: ");
readLine(pointer->postcode);
printf("Enter telephone number: ");
readLine(pointer->telno);
printf("Enter email address: ");
readLine(pointer->email);
if (start == NULL || strcmp(pointer->name, start->name)<0)
{
pointer->next=start;
start=pointer;
}
else
{
q = start;
while(q->next!=NULL && strcmp(q->next->name , pointer->name) < 0)
q=q->next;
pointer->next=q->next;
q->next=pointer;
}
}
void list()
{
if(start==NULL)
printf("No records to view");
/*for (temp=start;temp!=NULL;temp=temp->next)*/
temp = start;
while(temp!=NULL)
{
printf("\n");
printf("%s\n",temp->name);
printf("%s\n",temp->street);
printf("%s\n",temp->district);
printf("%s\n",temp->town);
printf("%s\n",temp->county);
printf("%s\n",temp->country);
printf("%s\n",temp->postcode);
printf("%s\n",temp->telno);
printf("%s\n",temp->email);
printf("\n");
temp=temp->next;
}
}
void readLine(char buffer[])
{
char character;
int i=0;
do
{
character=getchar();
buffer[i]=character;
++i;
}
while(character !='\n');
buffer[i-1]='\0';
}
void save()
{
FILE *fp;
if((fp=fopen("maillist", "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
temp=start;
while(temp){
fwrite(temp,
sizeof(struct addr), 1, fp);
temp = temp->next;
}
fclose(fp);
}
void load()
{
FILE *fp;
if((fp=fopen("maillist", "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}
start = ( address*) malloc(sizeof(address));
/*while(start){
temp=start->next;
free(temp);
start=temp;
}*/
free(start);
start=NULL;
while(!feof(fp)){
i = ( address*) malloc(sizeof(address));
temp = ( address*) malloc(sizeof(address));
if(!i){
printf("Out of memory.\n");
return;
}
if(1!=fread(i,sizeof(struct addr),1,fp))break;
if(start!=NULL)
{
temp = start;
while(temp->next!=NULL)
temp=temp->next;
i->next=NULL;
temp->next=i;
}
else
{
start=i;
i->next=NULL;
}
}
fclose(fp);
}
void txtoutput(void)
{
int t;
int count;
FILE *stream;
char filename[30];
count = 0;
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
stream = fopen(filename, "w+");
temp = start;
while(temp) {
count = count +1;
fprintf(stream,"%i\n",count);
fprintf(stream,"%s\n", temp->name);
fprintf(stream,"%s\n", temp->street);
fprintf(stream,"%s\n", temp->district);
fprintf(stream,"%s\n", temp->town);
fprintf(stream,"%s\n", temp->county);
fprintf(stream,"%s\n", temp->country);
fprintf(stream,"%s\n", temp->postcode);
fprintf(stream,"%s\n", temp->telno);
fprintf(stream,"%s\n", temp->email);
fprintf(stream,"\n");
temp=temp->next;
}
fclose(stream);
return;
}
void search()
{
int flag=0;
char name[40];
printf("Enter name of person to search for\n");
readLine(name);
temp=start;
while(temp)
{
if(strcmp(name, temp->name)==0)
{
printf("%s\n",temp->name);
printf("%s\n",temp->street);
printf("%s\n",temp->district);
printf("%s\n",temp->town);
printf("%s\n",temp->county);
printf("%s\n",temp->country);
printf("%s\n",temp->postcode);
printf("%s\n",temp->telno);
printf("%s\n",temp->email);
flag= 1;
}
temp=temp->next;
}
if(flag==0)
printf("Not found in list\n");
}
void deletion()
{
address *t, *pt;
t = ( address*) malloc(sizeof(address));
pt = ( address*) malloc(sizeof(address));
char name[40];
if(start == NULL)
{
printf("List is empty\n");
return;
}
printf("Enter name of person to be deleted\n");
readLine(name);
if(strcmp(name,start->name)==0)
{
temp=start;
start = start->next;
free(temp);
printf("Record is deleted\n");
return;
}
pt=start;
t=start->next;
while(t!=NULL&& strcmp(t->name,name)!=0)
{
pt =t;
t=t->next;
}
if(t==NULL)
{
printf("Record does not exist\n");
return;
}
if(strcmp(t->name,name)==0)
{
pt->next=t->next;
printf("Record is deleted\n");
free(t);
return;
}
}
A C database that puts a date stamp on each new record
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
#define MAX 10000
struct addr {
char name[40];
char street[40];
char district[40];
char town[40];
char county[40];
char country[40];
char postcode[40];
char telno[40];
char email[40];
int year;
int month;
int day;
}addr_list[MAX];
struct addr temp;
int counter;
void init_list(void), enter(void);
void delete(void), list(void);
void load(void), save(void), sort(void);
void txtoutput(void);
void search(void), searchbydate(void);
void readLine(char buffer[]);
void swap(int u, int v);
int main(void)
{
int choice;
char s[3];
counter = 0;
init_list();
for(;;){
printf("\n");
printf("1. Create a record\n");
printf("2. Delete a record\n");
printf("3. List the file\n");
printf("4. Save the file\n");
printf("5. Load the file\n");
printf("6. Sort the file\n");
printf("7. Search by name\n");
printf("8. Search by date\n");
printf("9. Output to a text file for printing or import into wp\n");
printf("10. Quit\n");
do{
printf("\nEnter your choice: ");
readLine(s);
choice=atoi(s);
if(choice== 1) enter();
if(choice==2) delete();
if(choice==3) list();
if(choice==4) save();
if(choice==5) load();
if(choice==6) sort();
if(choice==7) search();
if(choice==8) searchbydate();
if(choice== 9) txtoutput();
if(choice== 10) exit(0);
}while(choice < 1 && choice >10);
}
return 0;
}
void init_list(void)
{
register int t;
for(t=0; t<MAX; ++t) addr_list[t].name[0] ='\0';
}
void enter(void)
{
char s[40];
int i;
for(i=1; i<MAX; i++)
if(!*addr_list[i].name)
break;
if(i==MAX)
{
printf("Subscriber array full\n");
return;
}
printf("Enter information on new customer\n");
printf("Enter name: ");
readLine(addr_list[i].name);
printf("Enter street: ");
readLine(addr_list[i].street);
printf("Enter district / parish: ");
readLine(addr_list[i].district);
printf("Enter town / city: ");
readLine(addr_list[i].town);
printf("Enter county: ");
readLine(addr_list[i].county);
printf("Enter country: ");
readLine(addr_list[i].country);
printf("Enter postcode: ");
readLine(addr_list[i].postcode);
printf("Enter telephone number: ");
readLine(addr_list[i].telno);
printf("Enter email address: ");
readLine(addr_list[i].email);
time_t lt;
lt = time(NULL);
struct tm tm = *localtime(<);
addr_list[i].year = tm.tm_year + 1900;
addr_list[i].month = tm.tm_mon + 1;
addr_list[i].day = tm.tm_mday;
printf("%i %i %i\n", addr_list[i].day, addr_list[i].month,
addr_list[i].year);
counter=counter+1;
}
void delete(void)
{
int t;
int u;
printf("enter a record number #: ");
scanf("%i", &t);
getchar();
for(u=t; u<=counter; u++){
addr_list[u] = addr_list[u+1];
}
addr_list[counter].name[0] = '\0';
addr_list[counter].street[0] = '\0';
addr_list[counter].district[0] = '\0';
addr_list[counter].town[0] = '\0';
addr_list[counter].county[0] = '\0';
addr_list[counter].country[0] = '\0';
addr_list[counter].postcode[0] = '\0';
addr_list[counter].telno[0] = '\0';
addr_list[counter].email[0] = '\0';
addr_list[counter].year = '\0';
addr_list[counter].month = '\0';
addr_list[counter].day = '\0';
counter = counter -1;
}
void list(void)
{
register int t;
int count;
count=0;
for(t=1; t<=counter; t++) {
count = count +1;
printf("Record number: %i\n",count);
printf("%s\n", addr_list[t].name);
printf("%s\n", addr_list[t].street);
printf("%s\n", addr_list[t].district);
printf("%s\n", addr_list[t].town);
printf("%s\n", addr_list[t].county);
printf("%s\n", addr_list[t].country);
printf("%s\n", addr_list[t].postcode);
printf("%s\n", addr_list[t].telno);
printf("%s\n", addr_list[t].email);
printf("%i %i %i\n",addr_list[t].day, addr_list[t].month,
addr_list[t].year);
printf("\n");
}
}
void sort(void)
{
register int u;
register int v;
for(u=1; u<counter; u++)
for (v=u+1; v<=counter; v++){
if( strcmp(addr_list[u].name, addr_list[v].name) >0){
swap(u, v);
}
}
}
void swap(int u, int v)
{
temp = addr_list[u];
addr_list[u]=addr_list[v];
addr_list[v]=temp;
}
void save(void)
{
FILE *fp;
register int i;
if((fp=fopen("maillist", "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
for(i=1; i<MAX; i++)
if(*addr_list[i].name)
if(fwrite(&addr_list[i],
sizeof(struct addr), 1, fp)!=1)
printf("File write error.\n");
fclose(fp);
}
void load(void)
{
FILE *fp;
register int i;
if((fp=fopen("maillist", "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}
init_list();
for(i=1; i<MAX; i++){
if(fread(&addr_list[i],
sizeof(struct addr), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter=counter +1;
}
fclose(fp);
}
void txtoutput(void)
{
int t;
int count;
FILE *stream;
char filename[30];
count = 0;
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
stream = fopen(filename, "w+");
for(t=1; t<MAX; t++) {
if(addr_list[t].name[0]) {
count = count +1;
fprintf(stream,"%i\n",count);
fprintf(stream,"%s\n", addr_list[t].name);
fprintf(stream,"%s\n", addr_list[t].street);
fprintf(stream,"%s\n", addr_list[t].district);
fprintf(stream,"%s\n", addr_list[t].town);
fprintf(stream,"%s\n", addr_list[t].county);
fprintf(stream,"%s\n", addr_list[t].country);
fprintf(stream,"%s\n", addr_list[t].postcode);
fprintf(stream,"%s\n", addr_list[t].telno);
fprintf(stream,"%s\n", addr_list[t].email);
fprintf(stream,"%i %i %i\n", addr_list[t].day,
addr_list[t].month, addr_list[t].year);
fprintf(stream,"\n");
}
}
fclose(stream);
return;
}
void search(void)
{
int i;
int count;
count=0;
char s[40];
printf("\nEnter a name.\n");
readLine(s);
for(i=1;i<MAX;i++)
{
if(addr_list[i].name[0]) {
count = count +1;
}
if (strcmp(s, addr_list[i].name)==0)
{
printf("\nRecord number: %i\n", count);
printf("\nName: %s\n",addr_list[i].name);
printf("\nStreet: %s\n",addr_list[i].street);
printf("\nDistrict: %s\n",addr_list[i].district);
printf("\nTown: %s\n",addr_list[i].town);
printf("\nCounty: %s\n",addr_list[i].county);
printf("\nCountry: %s\n",addr_list[i].country);
printf("\nPostcode:%s\n",addr_list[i].postcode);
printf("\nTelephone number: %s\n",addr_list[i].telno);
printf("\nEmail address: %s\n",addr_list[i].email);
printf("\nDate: %i %i %i\n", addr_list[i].day,
addr_list[i].month, addr_list[i].year);
printf("\n");
}
}
}
void searchbydate(void)
{
int i;
int count;
count=0;
int d, m, y;
printf("\nEnter a day of the month for example 10\n");
scanf("%i",&d);
printf("\nEnter a month of the year for example 2\n");
scanf("%i",&m);
printf("\nEnter a year for example 2017\n");
scanf("%i",&y);
getchar();
for(i=1;i<MAX;i++)
{
if(addr_list[i].name[0]) {
count = count +1;
}
if(addr_list[i].day== d && addr_list[i].month==m
&& addr_list[i].year==y)
{
printf("\nRecord number: %i\n", count);
printf("\nName: %s\n",addr_list[i].name);
printf("\nStreet: %s\n",addr_list[i].street);
printf("\nDistrict: %s\n",addr_list[i].district);
printf("\nTown: %s\n",addr_list[i].town);
printf("\nCounty: %s\n",addr_list[i].county);
printf("\nCountry: %s\n",addr_list[i].country);
printf("\nPostcode: %s\n",addr_list[i].postcode);
printf("\nTelephone number: %s\n",addr_list[i].telno);
printf("\nEmail address: %s\n",addr_list[i].email);
printf("\nDate record created: %i %i %i\n",addr_list[i].day,
addr_list[i].month, addr_list[i].year);
printf("\n");
}
}
}
void readLine(char buffer[])
{
char character;
int i=0;
do
{
character=getchar();
buffer[i]=character;
++i;
}
while(character !='\n');
buffer[i-1]='\0';
}
#include<stdlib.h>
#include<string.h>
#include<time.h>
#define MAX 10000
struct addr {
char name[40];
char street[40];
char district[40];
char town[40];
char county[40];
char country[40];
char postcode[40];
char telno[40];
char email[40];
int year;
int month;
int day;
}addr_list[MAX];
struct addr temp;
int counter;
void init_list(void), enter(void);
void delete(void), list(void);
void load(void), save(void), sort(void);
void txtoutput(void);
void search(void), searchbydate(void);
void readLine(char buffer[]);
void swap(int u, int v);
int main(void)
{
int choice;
char s[3];
counter = 0;
init_list();
for(;;){
printf("\n");
printf("1. Create a record\n");
printf("2. Delete a record\n");
printf("3. List the file\n");
printf("4. Save the file\n");
printf("5. Load the file\n");
printf("6. Sort the file\n");
printf("7. Search by name\n");
printf("8. Search by date\n");
printf("9. Output to a text file for printing or import into wp\n");
printf("10. Quit\n");
do{
printf("\nEnter your choice: ");
readLine(s);
choice=atoi(s);
if(choice== 1) enter();
if(choice==2) delete();
if(choice==3) list();
if(choice==4) save();
if(choice==5) load();
if(choice==6) sort();
if(choice==7) search();
if(choice==8) searchbydate();
if(choice== 9) txtoutput();
if(choice== 10) exit(0);
}while(choice < 1 && choice >10);
}
return 0;
}
void init_list(void)
{
register int t;
for(t=0; t<MAX; ++t) addr_list[t].name[0] ='\0';
}
void enter(void)
{
char s[40];
int i;
for(i=1; i<MAX; i++)
if(!*addr_list[i].name)
break;
if(i==MAX)
{
printf("Subscriber array full\n");
return;
}
printf("Enter information on new customer\n");
printf("Enter name: ");
readLine(addr_list[i].name);
printf("Enter street: ");
readLine(addr_list[i].street);
printf("Enter district / parish: ");
readLine(addr_list[i].district);
printf("Enter town / city: ");
readLine(addr_list[i].town);
printf("Enter county: ");
readLine(addr_list[i].county);
printf("Enter country: ");
readLine(addr_list[i].country);
printf("Enter postcode: ");
readLine(addr_list[i].postcode);
printf("Enter telephone number: ");
readLine(addr_list[i].telno);
printf("Enter email address: ");
readLine(addr_list[i].email);
time_t lt;
lt = time(NULL);
struct tm tm = *localtime(<);
addr_list[i].year = tm.tm_year + 1900;
addr_list[i].month = tm.tm_mon + 1;
addr_list[i].day = tm.tm_mday;
printf("%i %i %i\n", addr_list[i].day, addr_list[i].month,
addr_list[i].year);
counter=counter+1;
}
void delete(void)
{
int t;
int u;
printf("enter a record number #: ");
scanf("%i", &t);
getchar();
for(u=t; u<=counter; u++){
addr_list[u] = addr_list[u+1];
}
addr_list[counter].name[0] = '\0';
addr_list[counter].street[0] = '\0';
addr_list[counter].district[0] = '\0';
addr_list[counter].town[0] = '\0';
addr_list[counter].county[0] = '\0';
addr_list[counter].country[0] = '\0';
addr_list[counter].postcode[0] = '\0';
addr_list[counter].telno[0] = '\0';
addr_list[counter].email[0] = '\0';
addr_list[counter].year = '\0';
addr_list[counter].month = '\0';
addr_list[counter].day = '\0';
counter = counter -1;
}
void list(void)
{
register int t;
int count;
count=0;
for(t=1; t<=counter; t++) {
count = count +1;
printf("Record number: %i\n",count);
printf("%s\n", addr_list[t].name);
printf("%s\n", addr_list[t].street);
printf("%s\n", addr_list[t].district);
printf("%s\n", addr_list[t].town);
printf("%s\n", addr_list[t].county);
printf("%s\n", addr_list[t].country);
printf("%s\n", addr_list[t].postcode);
printf("%s\n", addr_list[t].telno);
printf("%s\n", addr_list[t].email);
printf("%i %i %i\n",addr_list[t].day, addr_list[t].month,
addr_list[t].year);
printf("\n");
}
}
void sort(void)
{
register int u;
register int v;
for(u=1; u<counter; u++)
for (v=u+1; v<=counter; v++){
if( strcmp(addr_list[u].name, addr_list[v].name) >0){
swap(u, v);
}
}
}
void swap(int u, int v)
{
temp = addr_list[u];
addr_list[u]=addr_list[v];
addr_list[v]=temp;
}
void save(void)
{
FILE *fp;
register int i;
if((fp=fopen("maillist", "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
for(i=1; i<MAX; i++)
if(*addr_list[i].name)
if(fwrite(&addr_list[i],
sizeof(struct addr), 1, fp)!=1)
printf("File write error.\n");
fclose(fp);
}
void load(void)
{
FILE *fp;
register int i;
if((fp=fopen("maillist", "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}
init_list();
for(i=1; i<MAX; i++){
if(fread(&addr_list[i],
sizeof(struct addr), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter=counter +1;
}
fclose(fp);
}
void txtoutput(void)
{
int t;
int count;
FILE *stream;
char filename[30];
count = 0;
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
stream = fopen(filename, "w+");
for(t=1; t<MAX; t++) {
if(addr_list[t].name[0]) {
count = count +1;
fprintf(stream,"%i\n",count);
fprintf(stream,"%s\n", addr_list[t].name);
fprintf(stream,"%s\n", addr_list[t].street);
fprintf(stream,"%s\n", addr_list[t].district);
fprintf(stream,"%s\n", addr_list[t].town);
fprintf(stream,"%s\n", addr_list[t].county);
fprintf(stream,"%s\n", addr_list[t].country);
fprintf(stream,"%s\n", addr_list[t].postcode);
fprintf(stream,"%s\n", addr_list[t].telno);
fprintf(stream,"%s\n", addr_list[t].email);
fprintf(stream,"%i %i %i\n", addr_list[t].day,
addr_list[t].month, addr_list[t].year);
fprintf(stream,"\n");
}
}
fclose(stream);
return;
}
void search(void)
{
int i;
int count;
count=0;
char s[40];
printf("\nEnter a name.\n");
readLine(s);
for(i=1;i<MAX;i++)
{
if(addr_list[i].name[0]) {
count = count +1;
}
if (strcmp(s, addr_list[i].name)==0)
{
printf("\nRecord number: %i\n", count);
printf("\nName: %s\n",addr_list[i].name);
printf("\nStreet: %s\n",addr_list[i].street);
printf("\nDistrict: %s\n",addr_list[i].district);
printf("\nTown: %s\n",addr_list[i].town);
printf("\nCounty: %s\n",addr_list[i].county);
printf("\nCountry: %s\n",addr_list[i].country);
printf("\nPostcode:%s\n",addr_list[i].postcode);
printf("\nTelephone number: %s\n",addr_list[i].telno);
printf("\nEmail address: %s\n",addr_list[i].email);
printf("\nDate: %i %i %i\n", addr_list[i].day,
addr_list[i].month, addr_list[i].year);
printf("\n");
}
}
}
void searchbydate(void)
{
int i;
int count;
count=0;
int d, m, y;
printf("\nEnter a day of the month for example 10\n");
scanf("%i",&d);
printf("\nEnter a month of the year for example 2\n");
scanf("%i",&m);
printf("\nEnter a year for example 2017\n");
scanf("%i",&y);
getchar();
for(i=1;i<MAX;i++)
{
if(addr_list[i].name[0]) {
count = count +1;
}
if(addr_list[i].day== d && addr_list[i].month==m
&& addr_list[i].year==y)
{
printf("\nRecord number: %i\n", count);
printf("\nName: %s\n",addr_list[i].name);
printf("\nStreet: %s\n",addr_list[i].street);
printf("\nDistrict: %s\n",addr_list[i].district);
printf("\nTown: %s\n",addr_list[i].town);
printf("\nCounty: %s\n",addr_list[i].county);
printf("\nCountry: %s\n",addr_list[i].country);
printf("\nPostcode: %s\n",addr_list[i].postcode);
printf("\nTelephone number: %s\n",addr_list[i].telno);
printf("\nEmail address: %s\n",addr_list[i].email);
printf("\nDate record created: %i %i %i\n",addr_list[i].day,
addr_list[i].month, addr_list[i].year);
printf("\n");
}
}
}
void readLine(char buffer[])
{
char character;
int i=0;
do
{
character=getchar();
buffer[i]=character;
++i;
}
while(character !='\n');
buffer[i-1]='\0';
}
C database using quick sort (qsort) and a binary chop search
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define MAX 10000
typedef struct{
char name[40];
char street[40];
char district[40];
char town[40];
char county[40];
char country[40];
char postcode[40];
char telno[40];
char email[40];
}addr;
addr addr_list[MAX];
int cmp (const void * a, const void * b)
{
const addr *addrA = a;
const addr *addrB = b;
if(strcmp(addrA->name, addrB->name)>0)
return 1;
if(strcmp(addrA->name, addrB->name)<0)
return -1;
if(strcmp(addrA->name, addrB->name)==0)
return 0;
}
int num_addresses;
int counter;
void init_list(void), enter(void);
void delete(void), list(void);
void load(void), save(void);
void txtoutput(void);
void search(void);
void readLine(char buffer[]);
int main(void)
{
int choice;
char s[3];
counter = 0;
init_list();
for(;;){
printf("\n");
printf("1. Create a record\n");
printf("2. Delete a record\n");
printf("3. List the file\n");
printf("4. Save the file\n");
printf("5. Load the file\n");
printf("6. Sort the file\n");
printf("7. Search\n");
printf("8. Output to a text file for printing or import into wp\n");
printf("9. Quit\n");
do{
printf("\nEnter your choice: ");
readLine(s);
choice=atoi(s);
if(choice== 1) enter();
if(choice==2) delete();
if(choice==3) list();
if(choice==4) save();
if(choice==5) load();
if(choice==6) qsort(addr_list, counter+1, sizeof(addr), &cmp);
/*I assume it is counter+1 for qsort instead of counter because array of records
starts at addr_list[1] instead of addr_list[0]*/
if(choice==7) search();
if(choice== 8) txtoutput();
if(choice== 9) exit(0);
}while(choice < 1 && choice >9);
}
return 0;
}
void init_list(void)
{
register int t;
for(t=0; t<MAX; ++t) addr_list[t].name[0] ='\0';
}
void enter(void)
{
char s[40];
int i;
for(i=1; i<MAX; i++)
if(!*addr_list[i].name)
break;
if(i==MAX)
{
printf("Subscriber array full\n");
return;
}
printf("Enter information on new customer\n");
printf("Enter name: ");
readLine(addr_list[i].name);
printf("Enter street: ");
readLine(addr_list[i].street);
printf("Enter district / parish: ");
readLine(addr_list[i].district);
printf("Enter town / city: ");
readLine(addr_list[i].town);
printf("Enter county: ");
readLine(addr_list[i].county);
printf("Enter country: ");
readLine(addr_list[i].country);
printf("Enter postcode: ");
readLine(addr_list[i].postcode);
printf("Enter telephone number: ");
readLine(addr_list[i].telno);
printf("Enter email address: ");
readLine(addr_list[i].email);
counter=counter+1;
}
void delete(void)
{
int t;
int u;
printf("enter a record number #: ");
scanf("%i", &t);
getchar();
for(u=t; u<=counter; u++){
addr_list[u] = addr_list[u+1];
}
addr_list[counter].name[0] = '\0';
addr_list[counter].street[0] = '\0';
addr_list[counter].district[0] = '\0';
addr_list[counter].town[0] = '\0';
addr_list[counter].county[0] = '\0';
addr_list[counter].country[0] = '\0';
addr_list[counter].postcode[0] = '\0';
addr_list[counter].telno[0] = '\0';
addr_list[counter].email[0] = '\0';
counter = counter -1;
}
void list(void)
{
register int t;
int count;
count=0;
for(t=1; t<=counter; t++) {
count = count +1;
printf("Record number: %i\n",count);
printf("%s\n", addr_list[t].name);
printf("%s\n", addr_list[t].street);
printf("%s\n", addr_list[t].district);
printf("%s\n", addr_list[t].town);
printf("%s\n", addr_list[t].county);
printf("%s\n", addr_list[t].country);
printf("%s\n", addr_list[t].postcode);
printf("%s\n", addr_list[t].telno);
printf("%s\n", addr_list[t].email);
printf("\n");
}
}
void save(void)
{
FILE *fp;
register int i;
if((fp=fopen("maillist", "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
for(i=1; i<MAX; i++)
if(*addr_list[i].name)
if(fwrite(&addr_list[i],
sizeof(addr), 1, fp)!=1)
printf("File write error.\n");
fclose(fp);
}
void loadbackup(void)
{
FILE *fp;
register int i;
char filename[30];
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
if((fp=fopen(filename, "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}
init_list();
for(i=1; i<MAX; i++){
if(fread(&addr_list[i],
sizeof(addr), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter=counter+1;
}
fclose(fp);
}
void load(void)
{
FILE *fp;
register int i;
if((fp=fopen("maillist", "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}
init_list();
for(i=1; i<MAX; i++){
if(fread(&addr_list[i],
sizeof(addr), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter=counter +1;
}
fclose(fp);
}
void txtoutput(void)
{
int t;
int count;
FILE *stream;
char filename[30];
count = 0;
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
stream = fopen(filename, "w+");
for(t=1; t<MAX; t++) {
if(addr_list[t].name[0]) {
count = count +1;
fprintf(stream,"%i\n",count);
fprintf(stream,"%s\n", addr_list[t].name);
fprintf(stream,"%s\n", addr_list[t].street);
fprintf(stream,"%s\n", addr_list[t].district);
fprintf(stream,"%s\n", addr_list[t].town);
fprintf(stream,"%s\n", addr_list[t].county);
fprintf(stream,"%s\n", addr_list[t].country);
fprintf(stream,"%s\n", addr_list[t].postcode);
fprintf(stream,"%s\n", addr_list[t].telno);
fprintf(stream,"%s\n", addr_list[t].email);
fprintf(stream,"\n");
}
}
fclose(stream);
return;
}
void outputtwo(void)
{
FILE *fp;
register int i;
char filename[30];
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
if((fp=fopen(filename, "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
for(i=1; i<MAX; i++)
if(*addr_list[i].name)
if(fwrite(&addr_list[i],
sizeof(addr), 1, fp)!=1)
printf("File write error.\n");
fclose(fp);
}
void search(void)
{
int low, mid, top, found,count,countdown;
char s[40];
printf("\nEnter a name.\n");
readLine(s);
low = 1;
top = counter;
do
{
found = 0;
mid = (low + top)/2;
if (strcmp(s, addr_list[mid].name)==0)
{
printf("\nRecord number: %i\n", mid);
printf("\nName: %s\n",addr_list[mid].name);
printf("\nStreet: %s\n",addr_list[mid].street);
printf("\nDistrict: %s\n",addr_list[mid].district);
printf("\nTown: %s\n",addr_list[mid].town);
printf("\nCounty: %s\n",addr_list[mid].county);
printf("\nCountry: %s\n",addr_list[mid].country);
printf("\nPostcode:%s\n",addr_list[mid].postcode);
printf("\nTelephone number: %s\n",addr_list[mid].telno);
printf("\nEmail address: %s\n",addr_list[mid].email);
printf("\n");
/*break;*/
count = mid;
countdown = mid;
do
{
countdown=countdown-1;
if(strcmp(s, addr_list[countdown].name)==0)
{
printf("\nRecord number: %i\n", countdown);
printf("\nName: %s\n",addr_list[countdown].name);
printf("\nStreet: %s\n",addr_list[countdown].street);
printf("\nDistrict: %s\n",addr_list[countdown].district);
printf("\nTown: %s\n",addr_list[countdown].town);
printf("\nCounty: %s\n",addr_list[countdown].county);
printf("\nCountry: %s\n",addr_list[countdown].country);
printf("\nPostcode:%s\n",addr_list[countdown].postcode);
printf("\nTelephone number: %s\n",addr_list[countdown].telno);
printf("\nEmail address: %s\n",addr_list[countdown].email);
printf("\n");
}
}while(strcmp(s,addr_list[countdown].name)==0);
do{
count=count +1;
if(strcmp(s, addr_list[count].name)==0)
{
printf("\nRecord number: %i\n", count);
printf("\nName: %s\n",addr_list[count].name);
printf("\nStreet: %s\n",addr_list[count].street);
printf("\nDistrict: %s\n",addr_list[count].district);
printf("\nTown: %s\n",addr_list[count].town);
printf("\nCounty: %s\n",addr_list[count].county);
printf("\nCountry: %s\n",addr_list[count].country);
printf("\nPostcode:%s\n",addr_list[count].postcode);
printf("\nTelephone number: %s\n",addr_list[count].telno);
printf("\nEmail address: %s\n",addr_list[count].email);
printf("\n");
}
}while(strcmp(s,addr_list[count].name)==0);
return;
}
else
if(strcmp(s, addr_list[mid].name)<0)
top = mid -1;
else
if(strcmp(s, addr_list[mid].name)>0)
low = mid + 1;
}while(low<=top);
}
void readLine(char buffer[])
{
char character;
int i=0;
do
{
character=getchar();
buffer[i]=character;
++i;
}
while(character !='\n');
buffer[i-1]='\0';
}
#include<stdlib.h>
#include<string.h>
#define MAX 10000
typedef struct{
char name[40];
char street[40];
char district[40];
char town[40];
char county[40];
char country[40];
char postcode[40];
char telno[40];
char email[40];
}addr;
addr addr_list[MAX];
int cmp (const void * a, const void * b)
{
const addr *addrA = a;
const addr *addrB = b;
if(strcmp(addrA->name, addrB->name)>0)
return 1;
if(strcmp(addrA->name, addrB->name)<0)
return -1;
if(strcmp(addrA->name, addrB->name)==0)
return 0;
}
int num_addresses;
int counter;
void init_list(void), enter(void);
void delete(void), list(void);
void load(void), save(void);
void txtoutput(void);
void search(void);
void readLine(char buffer[]);
int main(void)
{
int choice;
char s[3];
counter = 0;
init_list();
for(;;){
printf("\n");
printf("1. Create a record\n");
printf("2. Delete a record\n");
printf("3. List the file\n");
printf("4. Save the file\n");
printf("5. Load the file\n");
printf("6. Sort the file\n");
printf("7. Search\n");
printf("8. Output to a text file for printing or import into wp\n");
printf("9. Quit\n");
do{
printf("\nEnter your choice: ");
readLine(s);
choice=atoi(s);
if(choice== 1) enter();
if(choice==2) delete();
if(choice==3) list();
if(choice==4) save();
if(choice==5) load();
if(choice==6) qsort(addr_list, counter+1, sizeof(addr), &cmp);
/*I assume it is counter+1 for qsort instead of counter because array of records
starts at addr_list[1] instead of addr_list[0]*/
if(choice==7) search();
if(choice== 8) txtoutput();
if(choice== 9) exit(0);
}while(choice < 1 && choice >9);
}
return 0;
}
void init_list(void)
{
register int t;
for(t=0; t<MAX; ++t) addr_list[t].name[0] ='\0';
}
void enter(void)
{
char s[40];
int i;
for(i=1; i<MAX; i++)
if(!*addr_list[i].name)
break;
if(i==MAX)
{
printf("Subscriber array full\n");
return;
}
printf("Enter information on new customer\n");
printf("Enter name: ");
readLine(addr_list[i].name);
printf("Enter street: ");
readLine(addr_list[i].street);
printf("Enter district / parish: ");
readLine(addr_list[i].district);
printf("Enter town / city: ");
readLine(addr_list[i].town);
printf("Enter county: ");
readLine(addr_list[i].county);
printf("Enter country: ");
readLine(addr_list[i].country);
printf("Enter postcode: ");
readLine(addr_list[i].postcode);
printf("Enter telephone number: ");
readLine(addr_list[i].telno);
printf("Enter email address: ");
readLine(addr_list[i].email);
counter=counter+1;
}
void delete(void)
{
int t;
int u;
printf("enter a record number #: ");
scanf("%i", &t);
getchar();
for(u=t; u<=counter; u++){
addr_list[u] = addr_list[u+1];
}
addr_list[counter].name[0] = '\0';
addr_list[counter].street[0] = '\0';
addr_list[counter].district[0] = '\0';
addr_list[counter].town[0] = '\0';
addr_list[counter].county[0] = '\0';
addr_list[counter].country[0] = '\0';
addr_list[counter].postcode[0] = '\0';
addr_list[counter].telno[0] = '\0';
addr_list[counter].email[0] = '\0';
counter = counter -1;
}
void list(void)
{
register int t;
int count;
count=0;
for(t=1; t<=counter; t++) {
count = count +1;
printf("Record number: %i\n",count);
printf("%s\n", addr_list[t].name);
printf("%s\n", addr_list[t].street);
printf("%s\n", addr_list[t].district);
printf("%s\n", addr_list[t].town);
printf("%s\n", addr_list[t].county);
printf("%s\n", addr_list[t].country);
printf("%s\n", addr_list[t].postcode);
printf("%s\n", addr_list[t].telno);
printf("%s\n", addr_list[t].email);
printf("\n");
}
}
void save(void)
{
FILE *fp;
register int i;
if((fp=fopen("maillist", "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
for(i=1; i<MAX; i++)
if(*addr_list[i].name)
if(fwrite(&addr_list[i],
sizeof(addr), 1, fp)!=1)
printf("File write error.\n");
fclose(fp);
}
void loadbackup(void)
{
FILE *fp;
register int i;
char filename[30];
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
if((fp=fopen(filename, "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}
init_list();
for(i=1; i<MAX; i++){
if(fread(&addr_list[i],
sizeof(addr), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter=counter+1;
}
fclose(fp);
}
void load(void)
{
FILE *fp;
register int i;
if((fp=fopen("maillist", "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}
init_list();
for(i=1; i<MAX; i++){
if(fread(&addr_list[i],
sizeof(addr), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter=counter +1;
}
fclose(fp);
}
void txtoutput(void)
{
int t;
int count;
FILE *stream;
char filename[30];
count = 0;
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
stream = fopen(filename, "w+");
for(t=1; t<MAX; t++) {
if(addr_list[t].name[0]) {
count = count +1;
fprintf(stream,"%i\n",count);
fprintf(stream,"%s\n", addr_list[t].name);
fprintf(stream,"%s\n", addr_list[t].street);
fprintf(stream,"%s\n", addr_list[t].district);
fprintf(stream,"%s\n", addr_list[t].town);
fprintf(stream,"%s\n", addr_list[t].county);
fprintf(stream,"%s\n", addr_list[t].country);
fprintf(stream,"%s\n", addr_list[t].postcode);
fprintf(stream,"%s\n", addr_list[t].telno);
fprintf(stream,"%s\n", addr_list[t].email);
fprintf(stream,"\n");
}
}
fclose(stream);
return;
}
void outputtwo(void)
{
FILE *fp;
register int i;
char filename[30];
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
if((fp=fopen(filename, "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
for(i=1; i<MAX; i++)
if(*addr_list[i].name)
if(fwrite(&addr_list[i],
sizeof(addr), 1, fp)!=1)
printf("File write error.\n");
fclose(fp);
}
void search(void)
{
int low, mid, top, found,count,countdown;
char s[40];
printf("\nEnter a name.\n");
readLine(s);
low = 1;
top = counter;
do
{
found = 0;
mid = (low + top)/2;
if (strcmp(s, addr_list[mid].name)==0)
{
printf("\nRecord number: %i\n", mid);
printf("\nName: %s\n",addr_list[mid].name);
printf("\nStreet: %s\n",addr_list[mid].street);
printf("\nDistrict: %s\n",addr_list[mid].district);
printf("\nTown: %s\n",addr_list[mid].town);
printf("\nCounty: %s\n",addr_list[mid].county);
printf("\nCountry: %s\n",addr_list[mid].country);
printf("\nPostcode:%s\n",addr_list[mid].postcode);
printf("\nTelephone number: %s\n",addr_list[mid].telno);
printf("\nEmail address: %s\n",addr_list[mid].email);
printf("\n");
/*break;*/
count = mid;
countdown = mid;
do
{
countdown=countdown-1;
if(strcmp(s, addr_list[countdown].name)==0)
{
printf("\nRecord number: %i\n", countdown);
printf("\nName: %s\n",addr_list[countdown].name);
printf("\nStreet: %s\n",addr_list[countdown].street);
printf("\nDistrict: %s\n",addr_list[countdown].district);
printf("\nTown: %s\n",addr_list[countdown].town);
printf("\nCounty: %s\n",addr_list[countdown].county);
printf("\nCountry: %s\n",addr_list[countdown].country);
printf("\nPostcode:%s\n",addr_list[countdown].postcode);
printf("\nTelephone number: %s\n",addr_list[countdown].telno);
printf("\nEmail address: %s\n",addr_list[countdown].email);
printf("\n");
}
}while(strcmp(s,addr_list[countdown].name)==0);
do{
count=count +1;
if(strcmp(s, addr_list[count].name)==0)
{
printf("\nRecord number: %i\n", count);
printf("\nName: %s\n",addr_list[count].name);
printf("\nStreet: %s\n",addr_list[count].street);
printf("\nDistrict: %s\n",addr_list[count].district);
printf("\nTown: %s\n",addr_list[count].town);
printf("\nCounty: %s\n",addr_list[count].county);
printf("\nCountry: %s\n",addr_list[count].country);
printf("\nPostcode:%s\n",addr_list[count].postcode);
printf("\nTelephone number: %s\n",addr_list[count].telno);
printf("\nEmail address: %s\n",addr_list[count].email);
printf("\n");
}
}while(strcmp(s,addr_list[count].name)==0);
return;
}
else
if(strcmp(s, addr_list[mid].name)<0)
top = mid -1;
else
if(strcmp(s, addr_list[mid].name)>0)
low = mid + 1;
}while(low<=top);
}
void readLine(char buffer[])
{
char character;
int i=0;
do
{
character=getchar();
buffer[i]=character;
++i;
}
while(character !='\n');
buffer[i-1]='\0';
}
A C database using a bubble sort
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define MAX 10000
typedef struct {
char name[40];
char street[40];
char district[40];
char town[40];
char county[40];
char country[40];
char postcode[40];
char telno[40];
char email[40];
}addr_list;
addr_list address[MAX];
int counter;
FILE *entercode;
char suppliedpassword[42];
char actualpassword[42];
void init_list(void), enter(void);
void delete(void), list(void);
void load(void), save(void), sort(void);
void loadbackup(void), outputthree(void);
void outputtwo(void), search(void);
void readLine(char buffer[]);
void swap(int u, int v);
void changepassword(void);
int main(void)
{
int choice;
char s[80];
if((entercode=fopen("id", "rb"))==NULL){
printf("Password not set yet.\n");
printf("Enter a password:\n");
readLine(actualpassword);
entercode=fopen("id", "wb");
if(fwrite(&actualpassword,sizeof(actualpassword), 1, entercode)!=1){
printf("File write error.\n");
sleep(5);
exit(0);
}
fclose(entercode);
}
else
{
printf("Enter your password.\n");
readLine(suppliedpassword);
if(fread(&actualpassword,sizeof(actualpassword), 1, entercode)!=1){
printf("File write error.\n");
sleep(5);
exit(0);
}
fclose(entercode);
if(strcmp(actualpassword, suppliedpassword) != 0){
printf("You have been caught red handed.\n");
sleep(5);
exit(0);
}
}
counter = 0;
init_list();
for(;;) {
printf("\n");
printf("1. Create a record\n");
printf("2. Delete a record\n");
printf("3. List the file\n");
printf("4. Save the file\n");
printf("5. Load the file\n");
printf("6. Sort the file\n");
printf("7. Search\n");
printf("8. Save to a back up file\n");
printf("9. Load from a backup file\n");
printf("10. Output to a text file for printing or import into wp\n");
printf("11. Change password\n");
printf("12. Quit\n");
do {
printf("\nEnter your choice: ");
readLine(s);
choice=atoi(s);
}while(choice < 0 && choice > 12);
switch(choice) {
case 1: enter();
break;
case 2: delete();
break;
case 3: list();
break;
case 4: save();
break;
case 5: load();
break;
case 6: sort();
break;
case 7: search();
break;
case 8: outputtwo();
break;
case 9: loadbackup();
break;
case 10: outputthree();
break;
case 11: changepassword();
break;
case 12: exit(0);
}
}
return 0;
}
void init_list(void)
{
register int t;
for(t=0; t<MAX; ++t) address[t].name[0] ='\0';
}
void enter(void)
{
char s[40];
int i;
for(i=1; i<MAX; i++)
if(!*address[i].name)
break;
if(i==MAX)
{
printf("Subscriber array full\n");
return;
}
printf("Enter information on new customer\n");
printf("Enter name: ");
readLine(address[i].name);
printf("Enter street: ");
readLine(address[i].street);
printf("Enter district / parish: ");
readLine(address[i].district);
printf("Enter town / city: ");
readLine(address[i].town);
printf("Enter county: ");
readLine(address[i].county);
printf("Enter country: ");
readLine(address[i].country);
printf("Enter postcode: ");
readLine(address[i].postcode);
printf("Enter telephone number: ");
readLine(address[i].telno);
printf("Enter email address: ");
readLine(address[i].email);
counter=counter+1;
}
void delete(void)
{
int t;
int u;
printf("enter a record number #: ");
scanf("%i", &t);
getchar();
for(u=t; u<=counter; u++){
address[u] = address[u+1];
}
address[counter].name[0] = '\0';
address[counter].street[0] = '\0';
address[counter].district[0] = '\0';
address[counter].town[0] = '\0';
address[counter].county[0] = '\0';
address[counter].country[0] = '\0';
address[counter].postcode[0] = '\0';
address[counter].telno[0] = '\0';
address[counter].email[0] = '\0';
counter = counter -1;
}
void list(void)
{
register int t;
int count;
count=0;
for(t=1; t<=counter; t++) {
count = count +1;
printf("Record number: %i\n",count);
printf("%s\n", address[t].name);
printf("%s\n", address[t].street);
printf("%s\n", address[t].district);
printf("%s\n", address[t].town);
printf("%s\n", address[t].county);
printf("%s\n", address[t].country);
printf("%s\n", address[t].postcode);
printf("%s\n", address[t].telno);
printf("%s\n", address[t].email);
printf("\n");
}
}
void sort(void)
{
register int u;
register int v;
for(u=1; u<counter; u++)
for (v=u+1; v<=counter; v++){
if( strcmp(address[u].name, address[v].name) >0){
swap(u, v);
}
}
}
void swap(int u, int v)
{
addr_list temp;
temp = address[u];
address[u] = address[v];
address[v] = temp;
}
void save(void)
{
FILE *fp;
register int i;
if((fp=fopen("maillist", "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
for(i=1; i<MAX; i++)
if(*address[i].name)
if(fwrite(&address[i],
sizeof(address[i]), 1, fp)!=1)
printf("File write error.\n");
fclose(fp);
}
void loadbackup(void)
{
FILE *fp;
register int i;
char filename[30];
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
if((fp=fopen(filename, "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}
init_list();
for(i=1; i<MAX; i++){
if(fread(&address[i],
sizeof(address[i]), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter=counter+1;
}
fclose(fp);
}
void load(void)
{
FILE *fp;
register int i;
if((fp=fopen("maillist", "rb"))==NULL) {
printf("Cannot open file,\n");
return;
}
init_list();
for(i=1; i<MAX; i++){
if(fread(&address[i],
sizeof(address[i]), 1, fp)!=1) {
if(feof(fp)) break;
printf("File read error.\n");
}
counter=counter +1;
}
fclose(fp);
}
void outputthree(void)
{
int t;
int count;
FILE *stream;
char filename[30];
count = 0;
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
stream = fopen(filename, "w+");
for(t=1; t<MAX; t++) {
if(address[t].name[0]) {
count = count +1;
fprintf(stream,"%i\n",count);
fprintf(stream,"%s\n", address[t].name);
fprintf(stream,"%s\n", address[t].street);
fprintf(stream,"%s\n", address[t].district);
fprintf(stream,"%s\n", address[t].town);
fprintf(stream,"%s\n", address[t].county);
fprintf(stream,"%s\n", address[t].country);
fprintf(stream,"%s\n", address[t].postcode);
fprintf(stream,"%s\n", address[t].telno);
fprintf(stream,"%s\n", address[t].email);
fprintf(stream,"\n");
}
}
fclose(stream);
return;
}
void outputtwo(void)
{
FILE *fp;
register int i;
char filename[30];
printf("Enter a file name.\n");
scanf("%s",filename);
printf("\n");
if((fp=fopen(filename, "wb"))==NULL) {
printf("Cannot open file.\n");
return;
}
for(i=1; i<MAX; i++)
if(*address[i].name)
if(fwrite(&address[i],
sizeof(address[i]), 1, fp)!=1)
printf("File write error.\n");
fclose(fp);
}
void search(void)
{
int i;
int count;
char s[40];
count=0;
printf("\nEnter a name.\n");
readLine(s);
if(strlen(s)!=0)
{
for(i=1;i<MAX;i++)
{
if(address[i].name[0]) {
count = count +1;
}
if (strcmp(s, address[i].name)==0)
{
printf("\nRecord number: %i\n", count);
printf("\nName: %s\n",address[i].name);
printf("\nStreet: %s\n",address[i].street);
printf("\nDistrict: %s\n",address[i].district);
printf("\nTown: %s\n",address[i].town);
printf("\nCounty: %s\n",address[i].county);
printf("\nCountry: %s\n",address[i].country);
printf("\nPostcode:%s\n",address[i].postcode);
printf("\nTelephone number: %s\n",address[i].telno);
printf("\nEmail address: %s\n",address[i].email);
printf("\n");
}
}
}
}
void changepassword()
{
if((entercode=fopen("id", "rb"))==NULL){
printf("Cannot open file.\n");
return;
}
else
{
printf("Enter your new password:\n");
readLine(actualpassword);
entercode=fopen("id", "wb");
if(fwrite(&actualpassword,sizeof(actualpassword), 1, entercode)!=1)
printf("File write error.\n");
fclose(entercode);
}
}
void readLine(char buffer[])
{
char character;
int i=0;
do
{
character=getchar();
buffer[i]=character;
++i;
}
while(character !='\n');
buffer[i-1]='\0';
}
Subscribe to:
Posts (Atom)