每日一题---7. 整数反转[力扣][Go]

func reverse(x int) int {
    sum := ""
    if x > 0 {
        s := strconv.Itoa(x)
        length := len(s)
        for i, _ := range s {
            sum += string(s[length - i -1])
        }
        atoi, _ := strconv.Atoi(sum)
        if atoi > 2147483647 {
            return 0
        }
        return atoi
    } else {
        s := strconv.Itoa(x)
        s2 := s[1:]
        length := len(s2)
        for i, _ := range s2 {
            sum += string(s2[length - i -1])
        }
        atoi, _ := strconv.Atoi(sum)
        atoi *= -1
        if atoi < -2147483648 {
            return 0
        }
        return atoi
    }
}