Simple C++ calculator

/*

A simple calculator to add, subtract, multiply or divide any two numbers.

*/



#include "stdafx.h"

#include <iostream>



using namespace std;



int main()

{

    double x; //This is the first number



    double y; //This is the second number



    char operation; //Define the mathematical operation



    double result; //Output result



    string tty; //Showing operator in use.



    cout << "Enter first number: ";

    cin >> x;



    cout << "Enter second number: ";

    cin >> y;



    cout << "Enter a to add, s to subtract, m to multiply and d to divide.: ";

    cin >> operation;



    if( operation == 'a'){

        result = x + y;

        tty = "+";

    }

    else if( operation == 's' ){

        result = x - y;

        tty = "-";

    }

    else if( operation == 'm' ){

        result = x * y;

        tty = "*";

    }

    else if( operation == 'd' ){

        result = x / y;

        tty = "/";

    }

    else{

        cout << "Enter a valid operation";

    }



    cout << x << tty << y << "= " << result << endl;

    return 0;

}