Leet Code OJ 263. Ugly Number [Difficulty: Easy]
题目：
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.
翻译：
写一个程序去校验一个给定的数是否是一个“丑数”。
“丑数”是一个正数，它的质因子只有2，3，5。例如6，8是丑数，而14不是一个丑数，因为它有一个质因子7。
提示，1作为特例被认为是一个丑数。
分析：
尝试去除以2，3，5，如果可以除尽，则递归调用函数，如果都除不尽，说明这不是一个丑数。
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);}if(num%3==0){return isUgly(num/3);}if(num%5==0){return isUgly(num/5);}return false;}
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