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.

public class Solution {
    public boolean 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;
    }
}