LCM and GCD in c++

#include <iostream>

int gcd(int a, int b)

{

    if (b == 0)

    {

        return a;

    }

    return gcd(b, a % b);

}

int lcm(int x, int y)

{

    return (x * y) / gcd(x, y);

}

int main()

{

    std::cout << lcm(4, 6);

    return 0;

}