Greatest common divisor

#include<iostream>
using namespace std;  
int GCD(int ,int );   
void main()
{
	int x,y;
	cout<<"Plz enter the two numbers : ";
	cin>>x>>y;
	cout<<"The GCD("<<x<<","<<y<<") = " << GCD(x,y)<<endl; 
}
int GCD(int x,int y)
{
	if(y>x)return GCD(y,x);
	if(x==y)return x;
	if(x%y==0)return y;
	return GCD(x,x-y);

}