4)Write a C program that generate a data file containing a list of customers using structure also File store the names, city and phone numbers of each customer.

 Write a program that will generate a data file containing a list of customers  and their  phone numbers. Use structure variables to store the names, city and phone numbers of each customer.

source file name: FileStruct.C

#include<stdio.h>

struct customer

{

char name[20];

char city[10];

long phone;

} ;

int  main()

{

int i;

struct customer cust[5];

char ch;

FILE *fp;

//clrscr();

fp=fopen("cust.txt","w");

for(i=0;i<5;i++)

{

printf("\n enter customer information: \n");

scanf( "%s%s%ld",cust[i].name,cust[i].city,&cust[i].phone);

fprintf(fp, " %s %s %ld\n",cust[i].name,cust[i].city,cust[i].phone);

}

fclose(fp);

printf("\n reads data from same file & display on screen :\n");

fp=fopen("cust.txt","r");

while((fscanf(fp, "%s%s%ld",cust[i].name,cust[i].city,&cust[i].phone))!=EOF)

{

printf( " %s %s %ld\n",cust[i].name,cust[i].city,cust[i].phone);

}

fclose(fp);

//getch();

return 0;

}

output: