Save phone contact information to a file - C Structure

C examples for Structure:Structure Value

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Description

Save phone contact information to a file

Demo Code

#include<stdio.h> 
#include <stdlib.h> 

int main() { //from w  w w  .  ja  v  a 2 s .c  om
   int response; 
   char *lName[20] = {0}; 
   char *fName[20] = {0}; 
   char *number[20] = {0}; 
   FILE *pWrite; 
   FILE *pRead; 
   printf("1\tAdd phone book entry\n"); 
   printf("2\tPrint phone book\n\n"); 
   printf("Select an option: "); 
   scanf("%d", &response); 
   if ( response == 1 ) { 
      printf("\nEnter first name: "); 
      scanf("%s", fName); 
      printf("\nEnter last name: "); 
      scanf("%s", lName); 
      printf("\nEnter phone number: "); 
      scanf("%s", number); 
      pWrite = fopen("phone_book.dat", "a"); 
      if ( pWrite != NULL ) { 
         fprintf(pWrite, "%s %s %s\n", fName, lName, number); 
         fclose(pWrite); 
      } 
      else 
         goto ErrorHandler;  //there is a file i/o error 
   } 
   else if ( response == 2 ) { 
      /* user wants to print the phone book */ 
      pRead = fopen("phone_book.dat", "r"); 
      if ( pRead != NULL ) { 
         printf("\nPhone Book Entries\n"); 
         while ( !feof(pRead) ) { 
           fscanf(pRead, "%s %s %s", fName, lName, number); 
           if ( !feof(pRead) ) 
              printf("\n%s %s\t%s", fName, lName, number); 
         } //end loop 
         printf("\n"); 
      } 
      else 
         goto ErrorHandler;  //there is a file i/o error 
   } 
   else { 
      printf("\nInvalid selection\n"); 
   } 
   exit(EXIT_SUCCESS); //exit program normally 
   ErrorHandler: 
        perror("The following error occurred"); 
        exit(EXIT_FAILURE); //exit program with error 
   
   return 0;
}

Result


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