class Solution {

public:

    bool isPalindrome(int x) {

        if(x < ) return false; //别忘了负数的情况

        if(x == ) return true;

        int tmp = x/;

        int pHead = ;

        int leftDigit, rightDigit, base;

        while(tmp){

            pHead*=;

            tmp /= ;

        }

        while(pHead >= ){

            leftDigit = x/pHead;

            rightDigit = x%;

            if(leftDigit != rightDigit) return false;

            x %= pHead;

            x /= ;

            pHead /= ;

        }

        return true;

    }

};