Leetcode263. Ugly Number

原题
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.
大意
如果一个正数的素因子只有2,3,5那我们就说这个数是丑陋的数，否则就不是
思路
不断地重复去除以2,3,5直至余数为0，否则的话则不是丑陋的
代码

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

原题地址