利用getchar()构建fgets()函数

#include <stdio.h>
#define SIZE 80
char * f_get(char arr[], int n);

int main(void)
{
   char input[SIZE];

   f_get(input,SIZE);
   printf("%s\n",input);

   return 0;
}

char * f_get(char arr[], int n)
{
   char *p;
   int i = 0;
   p = arr;
   *p = getchar();


   while (*p != '\n')
   {
      *++p = getchar();
   }
   *++p = '\0';
}