LeetCode OJ：Ugly Number（丑数）

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.

丑数的计算，分别去除数字中的2，3，5部分，如果数字被整除了那么就是丑数，否则不是，下见代码：

 class Solution {
 public:
     bool isUgly(int num) {
         if(num == )
             return false;
         while(num %  == ) num /= ;//exclude 2 factor
         while(num %  == ) num /= ;//exclude 3 factor
         while(num %  == ) num /= ;//exclude 5 factor
         return (num == );//is Ugly
     }
 };

java版本如下所示，方法相同：

public class Solution {
    public boolean isUgly(int num) {
        if(num == ) return false;
        while(num% == ) num/=;
        while(num% == ) num/=;
        while(num% == ) num/=;
        return num == ;
    }
}