Thread: Trying to understand arrays and pointers better need some input.

When I compile why am I getting an unknown file size error for the last function. The array isn't defined so why is size an issue?

Code:

include "stdafx.h"


void text_test(char text[]);
void text_test2( char *ptrtext);
void text_test3( char *array);
 int main()

{
    text_test("hello");
    text_test2("world");
    text_test3("again");
    
return 0;

}

void text_test(char text[])
{
    //char text[128];
    //ptrtext=text;

     printf("%s\n",text);
}

void text_test2( char *ptrtext)
{

    //char 2text[];
    //*ptrtext=2text;
    
    printf("%s\n",ptrtext);
}

void text_test3( char *array)
{
    char char_array[];
      *array = char_array[];

        printf("%s\n",char_array);
}