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From: goudreau@dg_rtp.UUCP (Bob Goudreau)
Newsgroups: news.software.b,comp.lang.c
Subject: Re: News for Xenix on PC AT ?
Message-ID: <1773@dg_rtp.UUCP>
Date: Mon, 27-Apr-87 11:35:40 EDT
Article-I.D.: dg_rtp.1773
Posted: Mon Apr 27 11:35:40 1987
Date-Received: Tue, 28-Apr-87 01:43:35 EDT
References: <18346@ucbvax.BERKELEY.EDU> <145@sds.UUCP> <17005@sun.uucp> <146@sds.UUCP> <17245@sun.uucp> <889@viper.UUCP>
Reply-To: goudreau@dg_rtp.UUCP (Bob Goudreau)
Organization: Data General, RTP North Carolina
Lines: 26
Xref: mnetor news.software.b:553 comp.lang.c:1913

In article <889@viper.UUCP> john@viper.UUCP (John Stanley) writes:
>In article <17245@sun.uucp> guy%gorodish@Sun.COM (Guy Harris) writes:
> >
> >  The C language lacks a token like Pascal's "nil", so a
> >constant expression with the value 0 must do double duty as a
> >representation of a null pointer.  
>
>  Wrong...  Ever hear of something called "NULL"?
>
>K&R, Page 97:
>  "We write NULL instead of zero, however, to indicate clearly that
>this is a special value for a pointer."...

Sorry, but Guy is correct.
NULL isn't a feature of C anymore than EOF, stdin or stdout are;
these are just literals defined in stdio.h.
The preprocessor converts these references to the appropriate constants,
so the compiler sees only the "bare bones" C.

-- 
Bob Goudreau
Data General Corp.
62 Alexander Drive
Research Triangle Park, NC  27709
(919) 248-6231
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