LeetCode Ugly Number

LeetCode Ugly Number

题目

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.

代码

class Solution {
public:
    bool isUgly(int num) {
        for (int i = 2; i < 6 && num; i++)while (num % i == 0) num /= i;
        return num == 1;
    }
};