9. Palindrome Number

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

class Solution {public:    bool isPalindrome(int x) {        if(x<0||((x!=0)&&(x%10==0)))            return false;        int sum=0;        while(x>sum)        {            sum=sum*10+x%10;            x/=10;        }        return (x==sum)||(x==sum/10);    }};