Other:reverse-integer

public static int reverse(int x) {
        if (x>=0) {
            int p = 0;
            while (x>0) {
                p = p * 10 + x % 10;
                System.out.println(p);
                x /= 10;
            }
            return p;
        } else {
            x = -x;
            int p = 0;
            while (x>0) {
                p = p * 10 + x % 10;
                x /= 10;
            }
            return -p;
        }
    }