leetcode-263-Ugly Number

                                             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.

推断一个数是否为丑数

class Solution {
public:
    bool isUgly(int num) {
        if (num == 0) return false;
        while (num%2 ==0) {
            num = num/2;
        }
        while (num%3 ==0) {
            num = num/3;
        }
        while (num%5 ==0) {
            num = num/5;
        }
        return num == 1;
    }
};