Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!lll-winken!uunet!hsi!stpstn!lerman
From: lerman@stpstn.UUCP (Ken Lerman)
Newsgroups: comp.lang.c
Subject: Re: ANSI Parsing/Preproc questions
Message-ID: <5689@stpstn.UUCP>
Date: 16 Oct 90 11:44:42 GMT
References: <383@goya.dit.upm.es>
Reply-To: lerman@stpstn.UUCP (Ken Lerman)
Organization: The Stepstone Corporation, Sandy Hook, CT 06482
Lines: 28

In article <383@goya.dit.upm.es> esink@turia.dit.upm.es (Eric Wayne Sink) writes:
[...]
>#define macro(X) variX
>/* obviously, some operator is needed above, if this is legal at all
>*/
>
>macro(5) = 3; /* expands to: vari5 = 3 */
>
[...]
>Eric W. Sink
>esink@turia.dit.upm.es

Another post showed (I love it when I get to see the answers before I
see the questions) the use of the ANSI ## operator to do this.

Prior to ANSI, many compilers accepted:

#define macro(X) vari/**/X
to expand:
    macro(5) = 3;
as:
    vari5 = 3;

I don't know if this is "official" K&R or not, but it worked on a lot
of machines.  (Note that the comment must be of zero length for this
to work.)

Ken