// Bob Myers
// File:  switch3.cpp
//
// a simple menu, processed with a switch

#include <iostream>

using namespace std;

void ShowMenu();

int main()
{
   int a, b;
   int result;
   char option;

   cout << "Enter two integers: ";
   cin >> a >> b;

   ShowMenu();
   cout << "Enter menu choice: ";
   cin >> option;

   switch(option)
   {
      case 'A':
      case 'a':
         result = a + b;
         break;

      case 'S':
      case 's':
         result = a - b;
         break;

      case 'M':
      case 'm':
         result = a * b;
         break;

      case 'Q':
      case 'q':
         result = a / b;
         break;

      case 'R':
      case 'r':
         result = a % b;
         break;

      default:  
         cout << "Invalid option.  No answer.\n";
         return 0;			// returns from main() early
					//  quits program
   }

   cout << "Result = " << result << '\n';

   return 0;
}

void ShowMenu()
{
   cout << "\n  ** Menu **\n\n";
   cout << "a  --  Add\n";
   cout << "s  --  Subtract\n";
   cout << "m  --  Multiply\n";
   cout << "q  --  Quotient\n";
   cout << "r  --  Remainder\n\n";
}