Dev - C++ - Funciones con parametros

#include <iostream>  // cout, cin

#include <string>    // to_string()

#include <limits>    // numeric_limits<>

using namespace std;

const int kError = numeric_limits<int>::min();

int add(int, int);

int subtract(int, int);

int multiply(int, int);

int divide(int, int);

int invoke(int, int, int (*)(int, int));

int main() {

    int op1, op2;

    cout << "Operand 1: ";

    cin >> op1;

    cout << "Operand 2: ";

    cin >> op2;

    int quotient = invoke(op1, op2, divide);

    cout << op1 << " + " << op2 << " = " << invoke(op1, op2, add) << '\n'

         << op1 << " - " << op2 << " = " << invoke(op1, op2, subtract) << '\n'

         << op1 << " x " << op2 << " = " << invoke(op1, op2, multiply) << '\n'

         << op1 << " / " << op2 << " = "

         << (quotient == kError ? "undefined" : to_string(quotient)) << '\n';

    return 0;

}

int add(int x, int y) {

    return x + y;

}

int subtract(int x, int y) {

    return x - y;

}

int multiply(int x, int y) {

    return x * y;

}

int divide(int x, int y) {

    return y == 0 ? kError : x / y;

}

int invoke(int x, int y, int (*function)(int, int)) {

    return function(x, y);

}