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.
代码如下：
public class Solution {
public boolean isUgly(int num) {
if(num<=0) return false;
if(num==1) return true;
while(num%2==0) num/=2;
while(num%3==0) num/=3;
while(num%5==0) num/=5;
return num==1;
}
}
运行结果：
