leetcode刷题笔记(Golang)--7. Reverse Integer

原题链接7. Reverse Integer
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.
解题思路：需要注意的溢出处理和负数的处理

func reverse(x int) int {
    res := 0
    for ; x != 0; x /= 10 {
        res = res*10 + x%10
        if res > math.MaxInt32 || res < math.MinInt32 {
            return 0
        }
    }
    return res
}