[leetcode]263. Ugly Number丑数

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.

丑数是一个正数且因子只包含2，3，5的数

class Solution {public:    bool isUgly(int num) {        while(1)        {            if(num == 1)    return true;            if(num <= 0) return false;                        //用%表示是否能整除，能整除且除了之后等于1则是uglynum            if(num % 2 == 0)            {                num = num / 2;                if(num == 1)    return true;            }            else if(num % 3 == 0)            {                num = num / 3;                if(num == 1)    return true;            }            else if(num % 5 == 0)            {                num = num / 5;                if(num == 1)    return true;            }            else            {                return false;            }        }            }};void main(){Solution *s = new Solution();bool result = s->isUgly(22);cout<<result;}