#include <iostream>

void call_by_value_swap(int v1, int v2) {
    //std::cout << "Address of v1, v2 is (" << &v1 << ", " << &v2 << ")" << std::endl;
    int temp = v1;
    v1 = v2;
    v2 = temp;
}

void call_by_address_swap(int *v1, int *v2) {
    //std::cout << "Address of v1, v2 is (" << v1 << ", " << v2 << ")" << std::endl;
    int temp = *v1;
    *v1 = *v2;
    *v2 = temp;
}

void call_by_reference_swap(int &v1, int &v2) {
    //std::cout << "Address of v1, v2 is (" << &v1 << ", " << &v2 << ")" << std::endl;
    int temp = v1;
    v1 = v2;
    v2 = temp;
}

int main (int argc, char *argv[]) {
    int x = 1;
    int y = 0;

    std::cout << "Origin x, y is (" << x << ", " << y << ")" << std::endl;
    //std::cout << "Origin address of x, y is (" << &x << ", " << &y << ")" << std::endl;

    std::cout << std::endl;

    call_by_value_swap(x, y);
    std::cout << "call_by_value x, y is (" << x << ", " << y << ")" << std::endl;

    std::cout << std::endl;

    x = 1;
    y = 0;
    call_by_address_swap(&x, &y);
    std::cout << "call_by_address x, y is (" << x << ", " << y << ")" << std::endl;

    std::cout << std::endl;

    x = 1;
    y = 0;
    call_by_reference_swap(x, y);
    std::cout << "call_by_reference x, y is (" << x << ", " << y << ")" << std::endl;
}