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.

题目很好理解，就是判断一个数是不是ugly number，即一个数的质数因子只有2,3,5，只要有其他的质数因子就不是丑陋数，那么就不断除以2,3,5这几个质数，如果还有剩下的（即结果不是1那么它肯定还有其他的质数因子）

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