263. Ugly Number

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本文提供了一个C++程序来判断给定的整数是否为丑数，即其质因数仅包含2、3、5。文章还强调了在编程中考虑边界情况的重要性，并给出了详细的代码实现。

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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.

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

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这个题目非常简单，但是真的给我提了个醒，要注意代码的稳健性.

注意考虑一些特殊边界情况！

class Solution {
public:
    bool isUgly(int num) {
        if(num<=0)return false;//这个是关键，不然过不了
        while(num%2==0){
            num/=2;
        }
        while(num%3==0){
            num/=3;
        }
        while(num%5==0){
            num/=5;
        }
        if(num==1)return true;
        else return false;
    }
};