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From: cmills@wyse.wyse.com
Newsgroups: comp.std.c
Subject: The Preprocessor and tokens
Keywords: cpp
Message-ID: <3137@wyse.wyse.com>
Date: 25 Mar 91 02:37:10 GMT
Sender: news@wyse.wyse.com
Reply-To: cmills@wyse.wyse.com ()
Organization: Wyse Technology
Lines: 24

Whilst composing this year's entry for the IOCCC, I stumbled on some
ANSI wierdness and I was wondering, what does the Standard say about
constuctions like these:

#define _	+ 42

int j = 6_;

#define N	42

int k = 0x7e+N;

My compiler refuses to exapnd the macros in these cases.  Is there a good
reason for this (other than the preprocessor is a little easier to write
if you define [0-9][0-9a-zA-Z_]* as a token)?  I was under the impression
that the preprocessor and the compiler agreed on what constituted a
token...  (I find the second example particulary obfuscating :)

Do K&R compilers do it any differently?

BTW: The compiler in question is GCC.


					Chris Mills