LeetCode 刷题： 丑数 ugly number 判断方法

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 {
public:
    bool isUgly(int num) {
        if(num <= 0)
        {
            return false;
        }
        while(num % 2 == 0)
        {
            num = num/2;
        }
        while(num % 3 == 0)
        {
            num = num/3;
        }
        while(num % 5 == 0)
        {
            num = num/5;
        }
        
        return num==1;
    }
};