#include <iostream>
using namespace std;

void swap(int &val1, int &val2) {
	int tmp = val1;
	val1 = val2;
	val2 = tmp;
}

int main() {
	int x = 37;
	int y = 52;
	
	cout << "x: " << x << ", y: " << y << endl;
	
	swap(x, y);
	
	cout << "x: " << x << ", y: " << y << endl;

	return (0);
}