LeetCode 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?

 /*************************************************************************
     > File Name: LeetCode326.c
     > Author: Juntaran
     > Mail: Jacinthmail@gmail.com
     > Created Time: 2016年05月10日 星期二 02时42分09秒
  ************************************************************************/

 /*************************************************************************

     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?

  ************************************************************************/

 #include "stdio.h"

 int isPowerOfThree(int n) {
     double tmp = log10(n)/log10();
     return tmp == (int)tmp ?  : ;
 }

 int main()
 {
     int n = ;
     int ret = isPowerOfThree(n);
     printf("%d\n",ret);

     n = ;
     ret = isPowerOfThree(n);
     printf("%d\n",ret);

     return ;
 }