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.
Given num = 8 return true
Given num = 14 return false
public class Solution { /** * @param num an integer * @return true if num is an ugly number or false */ public boolean isUgly(int num) { // Write your code here if(num <= 0) return false; if(num == 1) return true; while(num % 2 == 0) num /= 2; while(num % 3 == 0) num /= 3; while(num % 5 == 0) num /= 5; return num == 1; } }
原文：http://www.cnblogs.com/goblinengineer/p/5361960.html