Question

#include <stdio.h>
#include<stdlib.h>
#define LIST.H onus;

int main ()
{
         char *p,*s;
         printf(" LIST.H ");
}

I expect LIST.H to print onus as out put.
But this does not happen.
upon compiling I get a warning

temp.c:3:13: warning: missing whitespace after the macro name

and the output is LIST.H not onus.
How can I get desired thing printed by the above macro?

UPDATE
I want to have the output
as onus with one space before and after the string.

Answer 1

Macros names cannot have . inside them. That’s why you get the warning:
warning: missing whitespace after the macro name, after LIST it expects a space, but it gets a . instead.

Also, when a macro name is inside a string(between "string") it is not replaced by the macro definition.

You could do this instead:

#define LISTH "onus"

// and then
  printf(LISTH);

which the preprocessor will transform to:

  printf("onus");

If you do:

#define LISTH "onus";

the preprocessor will transform it to:

 printf("onus";);

which won’t compile.