leetcode 263. Ugly Number

https://www.cnblogs.com/grandyang/p/4741934.html

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;
        return num==1;
    }
};