#include <iostream>
#include <cstdlib>
using namespace std;


void square(int& x);

int main()
{
	int x {0};

	cout << "Choose a number to square:\n";
	cin >> x;

	square(x);

	cout << "Your number squared equals " << x << ".\n";

	return EXIT_SUCCESS;
}

void square(int& x)
{
	x *= x;
}