G.C.D using recursion.cpp

#include <iostream>
using namespace std;
int gcd(int x, int y) {
	if (x == 0 || y==0) 
		return y,x;//will input non-zero number when even one number inputed in zero
	if (x == y)
		return x;//will return first number when both of the numbers are equal
	if (x > y) 
    return gcd(x - y, y);//when first number is greater than second
	if( y > x )
	return gcd(x, y - x);//when second number is greater than first
}
int main4() {
	cout << "\t\t\t***Program to calculate the G.C.D for two integers usin recurion.***" << endl;
	cout << "Please enter two integers: " << endl;
	int x,y;
	cin >> x >> y;
	cout << "The G.C.D of " << x << "and " << y << " is " << gcd(x, y);//calling function in the main function
	return 0;
}