leetcode 7. Reverse Integer

public class Solution {
        public int reverse(int x) {
            boolean flag = (x < 0)? true:false;
            if(flag) 
            x = -x;
            int rec = 0;
            int res = 0;
            while(x != 0)
            {
                res = res*10 + x%10;
                rec = x;
                x /= 10;
                System.out.println(res);
            }
            
            
            if(res % 10 != rec)
            return 0;
            if(flag) 
            return -res;
            return res;
            
        }
}