[leetcode] Ugly Number 解题报告

题目链接：https://leetcode.com/problems/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.

思路：送分题，^.^，只要注意判断一下非法数据就行了

代码如下：

class Solution {
public:
    bool isUgly(int num) {
        if(num <= 0)
            return false;
        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;
    }
};