题目：Determine whether an integer is a palindrome. Do this without extra space.

public class Solution {
    public boolean isPalindrome(int x) {
        if(x<0)
           return false;
        int s=0,t=0;
        int k=x;
        while(x!=0)
        {
            t = x%10;
            s = 10*s+t;
            x = x/10;
        }
        System.out.println(s);
        if(s==k)
          return true;
        else
          return false;
    }
}