#include <iostream>
#include <stdlib.h>
#include <ctype.h>
using namespace std;
float doMath(float X, float Y);
int Function, X, Y;
int main()
{
    cout << "What function do you want?\n1 for Addition\n2 for Subtraction\n3 for Multiplication\n4 for Division\n$ ";
    cin >> Function;
    cout << "Enter the first number\n$ ";
    cin >> X;
    cout << "Enter the second number\n$ ";
    cin >> Y;
    cout << "The Answer is " << doMath(X,Y) << endl;
    system("Pause");
    return 0;
}

float doMath (float X, float Y)
{
    switch(Function)
    {
    case 1:
        return X+Y;
        break;
    case 2:
        return X-Y;
        break;
    case 3:
        return X*Y;
        break;
    case 4:
        return X/Y;
        break;
    default:
        cout << "Unknown";
        break;
    }
}