Thread: Is this a macro?

I'm writing a bit of code using linked lists, and the statement...

(struct node *) NULL

keeps popping up all over the place.

I would like to alias that as something else (e.g.) NNULL, so I tried...

#define NNULL "(struct node *) NULL"

then wrote

if( head_node != NNULL )
...

but the compiler said I couldn't compare a pointer to struct with a pointer to char, which is understandable.

Do I need to write a macro to implement this... and if so, how do I do it.

Thanks.