leetcode 263 Ugly Number C++

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