Palindrome Number

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 div = 1;
        while (x / div >= 10) {
        	div *= 10;
        }
        while (x != 0) {
        	int left = x / div;
        	int right = x % 10;
        	if (left != right) {
        		return false;
        	}
        	x = (x % div) / 10;
        	div /= 100;
        }
        return true;
    }
}