#include <iostream>

void swap(int *a, int *b) {
    int t = *b;
    *b = *a;
    *a = t;
}

int main(int argc, char ** argv) {
    int a = 4;
    int b = 3;
    swap(&a, &b);

    std::cout << a << " " << b;

    return 0;
}