/*
 * This is an example of a menu-driven program. For classroom demo.
 * Xiannong Meng
 * created: feb-11-1999
 * last modified: feb-22-2001
 */
#include <iostream>
#include <string>

using namespace std;

int PromptAndRead(string); // this needs to be global so all can use it

void main(void)
{
   // function prototypes
   int Menu(void);
   void Addition(void), 
        Subtraction(void), 
        Multiplication(),
        Division();

   int choice;

   do
   {
      choice = Menu();      // display menu and get user selection
      switch (choice)
      {
         case 1 : Addition();      // do addition
                  break;
         case 2 : Subtraction();   // do subtraction
                  break;
         case 3 : Multiplication();// do multiplication
                  break;
         case 4 : Division();      // do division
                  break;
         case 0 : break;           // exit
         default : cout << " illegal operation\n";   // error
      }            
   } while (choice != 0);
} // main

int Menu(void)
{
   int choice;
   cout << " addtion : \t\t 1)\n";
   cout << " subtraction : \t\t 2)\n";
   cout << " multiplication : \t 3)\n";
   cout << " division : \t\t 4)\n";
   cout << " exit : \t\t 0)\n";
   cout << " select an operation : ";
   cin >> choice;
   return choice;
} // menu

void Addition(void) 
{
   int i = PromptAndRead(" please enter an integer : ");
   int j = PromptAndRead(" please enter an integer : ");
   cout << i << " + " << j << " = " << i + j << endl;
} // addition

void Subtraction(void) 
{
   cout << " in Subtraction\n";
}

void Multiplication(void) 
{
   cout << " in Multiplication\n";
}

void Division(void) 
{
   cout << " in Divistion\n";
}

int PromptAndRead(string prompt)
{
    int value;

    cout << prompt;
    cin >> value;
    return value;
}