Greatest Common Divisor

#include <iostream>
using namespace std;

int GCD(int a, int b)
{
    while( 1 )
    {
        a = a % b;
		if( a == 0 )
			return b;
		b = b % a;

        if( b == 0 )
			return a;
    }
}

int main()
{
	int x, y;

	cout << "This program allows calculating the GCD\n";
	cout << "Value 1: ";
	cin >> x;
	cout << "Value 2: ";
	cin >> y;

	cout << "\nThe Greatest Common Divisor of "
	     << x << " and " << y << " is " << GCD(x, y) << endl;  

	return 0;
}