LeetCode263:Ugly Number

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.

public static boolean isUgly(int num) {
		if (num <= 0)
			return false;
		while (num >= 2 && num % 2 == 0)
			num /= 2;
		while (num >= 3 && num % 3 == 0)
			num /= 3;
		while (num >= 5 && num % 5 == 0)
			num /= 5;
		if (num == 1)
			return true;
		return false;
	}

LeetCode263:Ugly Number

原文：http://blog.csdn.net/shangqing1123/article/details/47835799