#include <iostream>

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

main()
{
	int x = 15, y = 74;
	std::cout << x << " " << y << std::endl;
	swap(&x, &y);
	std::cout << x << " " << y << std::endl;
}