c++,简洁，没有使用long long

class Solution {
public:
    /**
     * 
     * @param x int整型 
     * @return int整型
     */
    int reverse(int x) {
        // write code here
        int res = 0;
        while (x != 0) {
            int t = x % 10;
            x /= 10;
            if (res > INT_MAX / 10 ) return 0;
            if (res < INT_MIN / 10 ) return 0;
            res = res * 10 + t;
        }
        return res;
    }
};