263. Ugly Number--LeetCode Record

Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.

Note that 1 is typically treated as an ugly number.

    func isUgly(num: Int) -> Bool {        if num == 0 {            return false        }        var n = num        while(true){            if n % 2 == 0 {                n = n>>1             }else if n % 5 == 0 {                n /= 5            }else if n % 3 == 0 {                n /= 3            }else if n == 1{                return true            }else {                return false            }        }        return false    }