public class Solution {
    public int reverse(int x) {
       int result = 0;

       while (x != 0){

           int ones = x % 10;
           x = x / 10;
           Integer tempMult = safeMult(result, 10);
           if (tempMult == null){
               return 0;
           }
           result = tempMult;
           result += ones;
       }

       return result;
    }

    private int sigMax(int x, int y){
        return Integer.signum(x) == Integer.signum(y) ? Integer.MAX_VALUE : Integer.MIN_VALUE;
    }

    private Integer safeMult(int a, int b){
        int maximum = sigMax(a, b);
        if (a != 0 && (b > 0 && b > maximum / a ||
               b < 0 && b < maximum / a))
        {
            return null;
        }
        return a*b;

    }

}