[LeetCode] 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 res = 0;
        while(x)
        {
            res *= 10;
            int y = x % 10;
            res += y;
            x /= 10;
        }
        if(abs(res) & (0x1111<<31)) return 0;
        return res;
    }
};