LeetCode

要求:

给出一个 32 位的有符号整数，你需要将这个整数中每位上的数字进行反转。

class Solution {
    func reverse(_ x: Int) -> Int {
        var rev = 0
        var temp = x
        while temp != 0 {
            let pop = temp % 10
            temp = temp / 10
            rev = rev * 10 + pop
            if rev > Int32.max || (rev == (Int32.max / 10) && pop > 7) {
                return 0;
            }
            if rev < Int32.min || (rev == (Int32.min / 10) && pop < -8) {
                return 0;
            }
        }
        return rev
    }
}