Reverse Integer

leetcode

Title

题目链接

Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321

Code

class Solution {
public:
    int reverse(int x) {
        // may be overflow when inverse the input
        long long base = 1L;
        int Max_Int = (int)((base << 31) - 1);
        int Min_Int = (int)(0 - (base << 31));
        long long res = 0;
        while(x != 0) {
            res = res * 10 + (x % 10);
            x = x / 10;
        }
        if(res > Max_Int || res < Min_Int) {
            return 0;
        }
        return (int)res;
    }
};