【LEETCODE】263-Ugly Number

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.

class Solution(object):
    def isUgly(self, num):
        """
        :type num: int
        :rtype: bool
        """
        
        if num<=0:
            return False
        
        for x in [2,3,5]:
            while num%x==0:     #只要num还能整除x，就继续整除
                num/=x
        
        return num==1           #当num整除过2，3，5之后，如果还不是1，说明不是ugly，如果是1，说明只能整除2，3，5中的，是ugly