263. Ugly Number - Easy¶

Problem:¶

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.

Solutions:¶

public class Solution {
    public boolean isUgly(int num) {
        if (num == 0) {
            return false;
        }
        while (num != 1) {
            if (num % 2 == 0) {
                num = num / 2;
                continue;
            }
            if (num % 3 == 0) {
                num = num / 3;
                continue;
            }
            if (num % 5 == 0) {
                num = num / 5;
                continue;
            }
            return false;
        }
        return true;
    }
}