7. Reverse Integer 【Easy】

avatar 2020年08月30日21:06:53 6 2460 views
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Question

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

Example 1:

Input: 123
Output: 321

Example 2:

Input: -123
Output: -321

Example 3:

Input: 120
Output: 21

Note:
Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range: [−231,  231 − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

 

 

My Answer

class Solution {
   public int reverse(int x) {
        int y = 0;
        while (x != 0) {
            int temp = y * 10 + x % 10;
            // 解决溢出情况,返回0
            if ((temp - x % 10) / 10 != y) {
                return 0;
            }
            y = temp;
            x = x / 10;
        }
        return y;
    }
}

 

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