Palindrome Number

注意负数

-2147483648的绝对值还是自己！！！(overflow)

public class Solution {
    public boolean isPalindrome(int x) {
        // IMPORTANT: Please reset any member data you declared, as
        // the same Solution instance will be reused for each test case.
        if( x<0 )
            return false;
        int tmp = x;
        int mask = 1;
        tmp /= 10;
        while(tmp > 0)
        {
            mask *= 10;
            tmp /= 10;
        }
        
        while(x > 0)
        {
            if(x / mask == x % 10)
            {
                x %= mask;
                x /= 10;
                mask /= 100;
            }
            else
                return false;
        }
        return true;
        
    }
}