Dev - C++ - Funciones

#include <iostream>

using namespace std;

double operacion(int a, int b, char op);

int main()

{

    int a, b;

    char op;

    cout << "A: "; cin >> a;

    cout << "Operacion: "; cin >> op;

    cout << "B: "; cin >> b;

    cout << endl << a << " " << op << " " << b << " = " << operacion(a, b, op) << endl;

    return 0;

}

double operacion(int a, int b, char op)

{

    switch (op)

    {

        case '+':

            return a + b;

            break;

        case '-':

            return a - b;

            break;

        case '*':

            return a * b;

            break;

        case '/':

            if (b != 0)

                return a / double(b);

            else

                cout << "ERROR DIV ";

            break;

        default:

            cout << "OPERACION NO VALIDA ";

            break;

    }

    return 0;

}