/*******************************************************/
//switch1.cpp
//R.A. Hillayrd
//Last Modified 09/24/2001
//
//program to compute a simple arithmetic expression
//using a switch statement
/*******************************************************/
#include<iostream>

using namespace std;

int main()
  {
  int leftOperand;
  int rightOperand;
  char op;
  int result;

  //prompt user and extract desired operation
  cout << "Enter a simple expression "
       << "(number operator number) : ";
  cin >> leftOperand >> op >> rightOperand;

  switch(op)
    {
    case '+' : result = leftOperand + rightOperand;
               break;  
    case '-' : result = leftOperand - rightOperand;
               break;  
    case '*' : result = leftOperand * rightOperand;
               break;  
    case '/' : if(rightOperand != 0)
                 result = leftOperand / rightOperand;
               else
                 {
                 cout << leftOperand << "/" << rightOperand << " cannot be computed - denominator is 0\n";
                 return 1;
                 }
               break;  
    default  : cout << op<< " is undefined\n";
               return 1;
    }//end switch

  cout << leftOperand << op << rightOperand << " = " << result << endl;
  }//end main

/*************************************************************/

Enter a simple expression (number operator number) : 5+5
5+5 = 10

Enter a simple expression (number operator number) : 5*6
5*6 = 30

Enter a simple expression (number operator number) : 9/3
9/3 = 3

Enter a simple expression (number operator number) : 9/4
9/4 = 2

Enter a simple expression (number operator number) : 9/0
9/0 cannot be computed - denominator is 0

Enter a simple expression (number operator number) : 9%3
% is undefined