Leetcode: 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.

recursively divide the number by 2,3,5 until finally reaches 1(true) or can't be divided by 2,3,5

public class Solution {
    public static boolean isUgly(int num) {
        if (num <= 0) {
            return false;
        }

        int[] divisors = {2, 3, 5};

        for(int d : divisors) {
            while (num % d == 0) {
                num /= d;
            }
        }
        return num == 1;
    }
}