263. Ugly Number(判断是否是丑数 剑指offer34)

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.

 

1 class Solution {
2     public boolean isUgly(int n) {
3         if(n==0) return false;
4         while(n%2==0) n/=2;
5         while(n%3==0) n/=3;
6         while(n%5==0) n/=5;
7         return n==1;
8     }
9 }