LeetCode 342

Power of Four

Given an integer (signed 32 bits), write a function to check whether it is a power of 4.

Example:
Given num = 16, return true. Given num = 5, return false.

Follow up: Could you solve it without loops/recursion?

 /*************************************************************************
     > File Name: LeetCode342.c
     > Author: Juntaran
     > Mail: Jacinthmail@gmail.com
     > Created Time: 2016年05月10日 星期二 02时50分00秒
  ************************************************************************/

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

     Power of Four

     Given an integer (signed 32 bits), write a function to check whether it is a power of 4.

     Example:
     Given num = 16, return true. Given num = 5, return false.

     Follow up: Could you solve it without loops/recursion?

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

 #include "stdio.h"

 int isPowerOfFour(int num) {
     double tmp = log10(num)/log10();
     return tmp == (int)tmp ?  : ;
 }

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

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

     return ;
 }