[leetcode 7] Reverse Integer

Reverse digits of an integer.

Example1: x = 123, return 321

Example2: x = -123, return -321

class Solution {public:    int reverse(int x) {        long long res = 0;        while (x) {            int i = x%10;            res = res*10 + i;            x /= 10;        }        if (res > INT_MAX || res < INT_MIN) {            return 0;        }        return res;    }};