LeetCode 0007 - Reverse Integer

Reverse Integer

Desicription

Given a 32-bit signed integer, reverse digits of an integer.

Example 1:

代码语言：javascript复制

Input: 123
Output:  321

Example 2:

代码语言：javascript复制

Input: -123
Output: -321

Example 3:

代码语言：javascript复制

Input: 120
Output: 21

Note:

Assume we are dealing with an environment which could only hold integers within the 32-bit signed integer range. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

Solution

代码语言：javascript复制

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

bit function integer range reverse

0 人点赞