Question

In C++,

Write a program that retrieves a phone number from a database of names and phone numbers. The program should ask the user to enter a name and then print the phone number of that person (or vice versa, number into name) The program should allow the user to repeat the operation as often as they would like to. The data is contained in two text files named "phoneNames.txt" and "phoneNums.txt". The files have one name or one phone number per line.

The first phone number in the phone number file corresponds to the first name in the name file. The second phone number in the phone number file corresponds to the second name in the name file. etc.

In depth Comments in code would be greatly appreciated to help follow along

Answer 1

#include<iostream>
#include <fstream>
#include <string>
#include<bits/stdc++.h>
using namespace std;

int main()
{
   int ch;
   cout<<"1.enter name and retrieve phone number\n2.enter number and retrieve name\nenter your choice:\t";
   cin>>ch;
   ifstream pnumber("phoneNums.txt");
   ifstream pname("phoneNames.txt");
   string temp;
   getline(cin, temp);
   int flag = 0;
   if(ch == 1)
   {
       string name;
       cout<<"enter name:\t";
       getline(cin, name);
       transform(name.begin(), name.end(), name.begin(), ::tolower);
       string line1;
       int count1 = 0;
       while(getline(pname,line1))
       {
           count1++;
           transform(line1.begin(), line1.end(), line1.begin(), ::tolower);
           if(name == line1)
           {
               flag = 1;
               break;
           }
       }
       if(flag == 1)
       {
           string line2;
           int count2 = 0;
           while(getline(pnumber,line2))
           {
               count2++;
               if(count1 == count2)
               {
                   cout<<name<<"\t"<<line2<<endl;
                   break;
               }
           }
       }
       else
       {
           cout<<"Phone number doesn't exist"<<endl;
       }
  
   }
   else if(ch == 2)
   {
       string phonenumber;
       cout<<"enter phone number:\t";
       getline(cin, phonenumber);
       string line1;
       int count1 = 0;
       int flag = 0;
       while(getline(pnumber,line1))
       {
           count1++;
           if(phonenumber == line1)
           {
               flag = 1;
               break;
           }
       }
       if(flag == 1)
       {
           string line2;
           int count2 = 0;
           while(getline(pname,line2))
           {
               count2++;
               if(count1 == count2)
               {
                   cout<<line2<<"\t"<<phonenumber<<endl;
                   break;
               }
           }
       }
       else
       {
           cout<<"Phone number doesn't exist"<<endl;
       }
   }
}

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Z Text Editor - Sat 17:45 Activities phoneNames.txt -/Desktop Open Save phoneNames.txt phonenumber.cpp student1.cpp phoneNums.txt name1 name2 name3 name4 Plain Text - Ln 4, Col 6 Tab Width: 8 - INS

Z Text Editor - Sat 17:45 Activities phoneNums.txt -/Desktop Open Save phoneNums.txt phoneNames.txt phonenumber.cpp student1.cpp 8500802007 9640558993 8096136398 9908210455 Plain Text - Tab Width: 8 - Ln 4, Col 11 INS

A Terminal - Activities Sat 17:45 deepika@deepika-TravelMate-P243-M: ~/Desktop File Edit View Search Terminal Help deepika@deepika-TravelMate-P243-M:~/Desktop$ ./a.out 1.enter name and retrieve phone number 2.enter number and retrieve name enter your choice: enter name: name1 name1 8500802007 deepika@deepika-TravelMate-P243-M:~/Desktop$ g++ phonenumber.cpp deepika@deepika-TravelMate-P243-M:~/Desktop$ ./a.out 1.enter name and retrieve phone number 2. enter number and retrieve name enter your choice: enter phone number: 2 9640558993 name2 9640558993 deepika@deepika-TravelMate-P243-M:~/Desktop$ ]