1 public class Solution {
 2     public boolean isPalindrome(int x) {
 3         if(x<0) return false;
 4         int div = 1;
 5         while(x/div>=10){
 6             div *=10;
 7         }
 8         while(x>0){
 9             if(x/div!=x%10) return false;
10             x = x%div/10;
11             div /=100;
12         }
13         return true;
14     }
15 }