【Leetcode】Ugly Number

题目链接：https://leetcode.com/problems/ugly-number/
题目：

Write a program to check whether a given number is an ugly number.

2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.1

思路：
easy 时间复杂度O(n)

算法：

 
    
 
1. public boolean isUgly(int num) {  
2. if (num <= 0) {  
3. return false;  
4.     }  
5. while (num % 2 == 0)  
6. 2;  
7. while (num % 3 == 0)  
8. 3;  
9. while (num % 5 == 0)  
10. 5;  
11.   
12. if (num == 1) {  
13. return true;  
14. else {  
15. return false;  
16.     }  
17. }