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.

Note that 1 is typically treated as an ugly number.

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

按定义做。

class Solution {

public:

    bool isUgly(int num) {

        if(num <= )

            return false;

        while(num %  == )

            num /= ;

        while(num %  == )

            num /= ;

        while(num %  == )

            num /= ;

        return num == ;

    }

};