Palindrome Number

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

回文数，比较简单。

bool isPalindrome(int x){    if (x < 0)        return false;    int temp = x;    int rev = 0;    while (temp > 0)    {        rev = rev * 10 + temp % 10;        temp /= 10;    }    return x == rev;}