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.

my solution(Language: golang):

func reverse(x int) int {
    y := int32(x)
    var ans int32
    for y != 0 {
        temp := ans * 10 + y % 10
        if temp/10 != ans {
            return 0
        }
        ans = temp
        y = y / 10
    }
    return int(ans)
}

Runtime: 4 ms