求最大公約數

public static void main(String[] args) {
        System.out.println(gys(63,14));
    }

    static int gys(int n,int m){
        while (n % m != 0){
            if((n = n% m) == 0){
                return m;
            }
            if((m = m% n) == 0){
                return n;
            }
        }
        return m;
    }