326. Power of Three

Given an integer, write a function to determine if it is a power of three.

Follow up:
Could you do it without using any loop / recursion?

class Solution {public:    bool isPowerOfThree(int n) {        while(n>=3)        {            if(n%3)              return false;             n/=3;        }        if(n==1)         return true;        else         return false;    }};