Question

Write a simple phonebook using c++ that read text file name list.txt and has:  first name, last name, and phone number as the example:

MIKEL BUETTNER 3545044
ENOCH BUGG 2856220
BRENDON LAVALLEY 433312
QUINTIN CREEK 5200413
JAMISON MILLETT 6243458
FLORENCIO PUMPHREY 3296862
DARRICK FREGOSO 6868442
TOBIAS GLASSMAN 6040564

and then ask the user to add a new contact first name, last name, and phone number and same the information into a file.

Use array and pointer

Answer 1

#include <cmath>

#include <cstdio>

#include <vector>

#include <iostream>

#include <algorithm>

using namespace std;

//creating the struct for the local storage of the phonebook for firstname , lastname and phonenumber as array of char

typedef struct phonebook_detail

   {

      char FirstName[20];

      char LastName[20];

      char PhoneNumber[20];

   } phone;

//Declaring the FILE pointer *pRead to read and *pWrite pointer to write the file

FILE *pRead;

FILE *pWrite;

//Function to Add_new_Entry

void Add_new_Entry (phone * phonebook)

{

        //use the pWrite pointer to open the list.txt file using fopen

         pWrite = fopen("list.txt", "a");

        //Take the use input as First name, Last name and phone number

         printf("\nFirst Name: ");

         scanf("%s", phonebook[counter-1].FirstName);

         printf("Last Name: ");

         scanf("%s", phonebook[counter-1].LastName);

        printf("Phone Number: ");

         scanf("%s", phonebook[counter-1].PhoneNumber);

        // Adding the details took by user as input to the file using fprint and pWrite

         fprintf(pWrite, "%s\t%s\t%s\n", phonebook[counter-1].FirstName, phonebook[counter-1].LastName, phonebook[counter-1].PhoneNumber);

        // close the file after saving the detail's in the file

         fclose(pWrite);

      }

int main(){

   //Declaring the phonebook pointer of typedef phone which used to store the user input

    phone *phonebook;

   // Allocate the memory using malloc function of typedef phone

    phonebook = (phone*) malloc(sizeof(phone)*100);

   // call the function adding new entry

    Add_new_Entry (phonebook);

}