Path: utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!decwrl!decvax!ucbvax!hplabs!hpda!athertn!ericb
From: ericb@athertn.Atherton.COM (Eric Black)
Newsgroups: comp.lang.c
Subject: Re: nested comments
Message-ID: <162@teak.athertn.Atherton.COM>
Date: 22 Jan 88 04:55:19 GMT
References: <13423@pyramid.pyramid.com> <7224@apple.UUCP>
Reply-To: ericb@Atherton.COM (Eric Black)
Organization: Atherton Technology, Sunnyvale, CA
Lines: 31

In article <7224@apple.UUCP> joemac@apple.UUCP (Joe MacDougald) writes:
>Rather then using nested comments, why not use:
>
>#ifdef 0
>
>int a = 1; 	/* COMMENT  */     
>int b = a;      /* COMMENT */
>
>#endif

Because "0" is not a legal preprocessor symbol, and some compilers/preprocessors
will complain (e.g. VMS C).

Instead, use:
	#if 0
	...
	#endif
or:
	#ifdef notdef
	...
	#endif

Compiling code containing the latter construct with a -Dnotdef is kind
of like certain FORTRAN (and other) compilers that share constants and
pass parameters by reference; the laws of the universe can change, and
3 can be equal to 2...

-- 
Eric Black	"Garbage in, Gospel out"
   UUCP:	{sun!sunncal,hpda}!athertn!ericb
   Domainist:	ericb@Atherton.COM