Make this operation reoccuring.

[zerokewl]

Hi,

Im a new student at c++ and have began learning from the book "C++ Programming From Problem Analysis to Program Design Edition 5 by - D.S Malik"

In the book chapter 5 asks a question to make this program repeat as many times as the person desires.

This program turns a string into numbers using the letters on a mobile phone like abc is 1, def is 2 etc..

I have it working fine but want to ask the user after the first run through, if they would like to process another string..

I have a problem with the cin >> letter; statement, it doesn't clear the input from the first runthrough and i can't get it to clear to run again when i try..

Here is the code for the first run through so how do i get the program to process a 2nd time and clearing the first input?

/*
Author: Jeffrey Holmes
Date: 
Description: 
*/
#include <iostream>
using namespace std;
#include <conio.h>
#include <iomanip>
#include <stdlib.h>
#include <string>



int main()
{
    system("CLS");
    
    char letter, processagain;
    bool stop = false;
    string line, result, string1 = "";
    int i=0, j=0;
    
    cout << "Program to convert letters to their corresponding telephone digits." << endl;
    
    cout << "Enter a string to convert: ";
    cin >> letter;
    
    while (letter)
    {
      if (i < 7 && letter >='A' && letter <='z' || letter == ' ')
      {
          switch (i)
          {
              case 3:
                   result = result + '-';
              default:
                  line = line + letter;
                  switch (letter)
                  {
                     case ' ':
                          result = result + ' ';
                          i = i - 1;
                          break;
                     case 'A':
                     case 'B':
                     case 'C':
                     case 'a':
                     case 'b':
                     case 'c':
                          result = result + '2';
                          break;
                     case 'D':
                     case 'E':
                     case 'F':
                     case 'd':
                     case 'e':
                     case 'f':
                          result = result + '3';
                          break;
                     case 'G':
                     case 'H':
                     case 'I':
                     case 'g':
                     case 'h':
                     case 'i':
                          result = result + '4';
                          break;
                     case 'J':
                     case 'K':
                     case 'L':
                     case 'j':
                     case 'k':
                     case 'l':
                          result = result + '5';
                          break;
                     case 'M':
                     case 'N':
                     case 'O':
                     case 'm':
                     case 'n':
                     case 'o':
                          result = result + '6';
                          break;
                     case 'P':
                     case 'Q':
                     case 'R':
                     case 'S':
                     case 'p':
                     case 'q':
                     case 'r':
                     case 's':
                          result = result + '7';
                          break;
                     case 'T':
                     case 'U':
                     case 'V':
                     case 't':
                     case 'u':
                     case 'v':
                          result = result + '8';
                          break;
                     case 'W':
                     case 'X':
                     case 'Y':
                     case 'Z':
                     case 'w':
                     case 'x':
                     case 'y':
                     case 'z':
                          result = result + '9';
                     default:
                        break;
                  }
                  cin.get(letter);
                  i = i + 1;
          }
     }
     else
       break;
    } //end while
    cout << line << " = " << result << endl;
       
    cout << "Finished" << endl;
    
    system("PAUSE");
    return 0;
    
}