Leetcode：263. Ugly Number（factors是否只包含2 3 5）

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.

用num来% 2 3 5 如果为0 那么num就除以多少，最后为1 说明没有其他factors

代码：

public boolean isUgly(int num) {        if (num <= 0) {            return false;        }        int[] divi = {2, 3, 5};        for(int d : divi) {            while (num % d == 0) {                num /= d;            }        }        return num == 1;    }