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From: greenber@acf4.UUCP (ross m. greenberg)
Newsgroups: net.lang.c
Subject: Re: runtime 'sizeof()'?
Message-ID: <800002@acf4.UUCP>
Date: Sun, 27-Jan-85 18:16:00 EST
Article-I.D.: acf4.800002
Posted: Sun Jan 27 18:16:00 1985
Date-Received: Tue, 29-Jan-85 06:58:32 EST
References: <33@gitpyr.UUCP>
Organization: New York University
Lines: 38

<>
What I always have is a little .h file:
= = = = = = = = = = =
#ifndef	NULL
#define	NULL	(int) 0
#endif

#ifndef NULLP
#define	NULLP	(char *)NULL
#endif
 = = = = = = = = = = =
Aside from being "portable", it really makes code easier to read because
you know which are apples and which are pears.

I also go the whole way with additional NULLs defined (NULLL, NULLS,
NULLD, NULLF, etc.), because this won't always work:

long	var;
	if (var == NULL)  {stuff}

Then of course the question is, will this work:

long	var;
	if (var) {stuff}

I've found that it doesn't always (flaky compilers!), so I have
made my code (when needed):

long	var;
	if (var != NULLL) {stuff}

Sloppy, but portable!!! (and easy to understand, even for me!)

Didn't we have this discussion about three months ago??


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Ross M. Greenberg  @ NYU   ----> { allegra,ihnp4 }!cmcl2!acf4!greenber  <----