LeetCode : 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.

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