263. Ugly Number-丑数

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.

Example 1:
Input: 6
Output: true
Explanation: 6 = 2 × 3

Example 2:
Input: 8
Output: true
Explanation: 8 = 2 × 2 × 2

Example 3:
Input: 14
Output: false
Explanation: 14 is not ugly since it includes another prime factor 7.

Note:
1 is typically treated as an ugly number.
Input is within the 32-bit signed integer range: [−231,  231 − 1].

Solution in python:

class Solution:
    def isUgly(self, num: int) -> bool:
        while num > 1:
            if num % 2 == 0:
                num //= 2
                continue
            if num % 3 == 0:
                num //= 3    
                continue       
            if num % 5 == 0:
                num //= 5
                continue
            break
        if num == 1:    return True
        else:   return False