leetcode--Palindrome Number

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

class Solution 
{
public:
    bool isPalindrome(int x) 
    {
        if(x < 0) return false;
        if(x < 10) return true;
        int y = 0;
        int tmp = x;
        while(x)
        {
            y = y*10 + x % 10;
            x = x/ 10;
        }
        if(tmp == y) return true;
        return false;
    }
};