#include <iostream>

void swap_int(int& a, int& b) {
	int tmp;

	tmp = a;
	a = b;
	b = tmp;
}

void swap_double(double& a, double& b) {
	double tmp;

	tmp = a;
	a = b;
	b = tmp;
}

int main()
{
	int a=1, b=2;

	swap_int(a, b);
	std::cout << a << " " << b << "\n";

	double x=1., y=2.;

	swap_double(x, y);
	std::cout << x << " " << y << "\n";
}