【LeetCode】263. Ugly Number 丑数判断

题目：

         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.

理解：

        给定一个正整数，判断这个正整数是否为丑数。

        丑数的定义为：1为丑数，丑数可以表示为有限个2、 3、 5相乘。

代码：

class Solution {
public:
    bool isUgly(int num) {
        if(num<=0)
             return 0;
        int temp1=num%2;
        int temp2=num%3;
        int temp3=num%5;
        while(temp1==0||temp2==0||temp3==0)
        {
            if(temp1==0)
                num/=2;
            else if(temp2==0)
                num/=3;
            else
                num/=5;
            temp1=num%2;
            temp2=num%3;
            temp3=num%5;
        }
        return num==1;
    }
};