LeetCode OJ：Ugly Number（丑数）

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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：

 1 class Solution {
 2 public:
 3     bool isUgly(int num) {
 4         if(num == 0)
 5             return false;
 6         while(num % 2 == 0) num /= 2;//exclude 2 factor
 7         while(num % 3 == 0) num /= 3;//exclude 3 factor
 8         while(num % 5 == 0) num /= 5;//exclude 5 factor
 9         return (num == 1);//is Ugly
10     }
11 };

LeetCode OJ：Ugly Number（丑数）

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原文地址：http://www.cnblogs.com/-wang-cheng/p/4858360.html