Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!chinacat!sequoia!unisql!pckim
From: pckim@unisql.UUCP (Pyung-Chul Kim)
Newsgroups: comp.lang.c
Subject: Re: ANSI CPP string concatenation
Summary: refer to FAQ 37.
Keywords: ANSI CPP string concatenation
Message-ID: <1366@unisql.UUCP>
Date: 20 Jun 91 14:46:52 GMT
References: <1271@cnw01.storesys.coles.oz.au>
Reply-To: pckim@unisql.UUCP (Pyung-Chul Kim)
Organization: UniSQL, Inc., Austin, Texas
Lines: 36

In article <1271@cnw01.storesys.coles.oz.au> nigel@cnw01.storesys.coles.oz.au (Nigel Harwood) writes:
>Does anyone know if you can append strings in ANSI C.
>
>For example I want a macro which appends one of its numeric
>arguments to a string coded into the marco.
>
>#define	APPEND(x,v)	{ donothing+x = v; }
>
>I know that the '+' isn't what I'm after but using whatever the method
>turns out to be what I want it to generate from APPEND(1,123) is:
>
>	{ donothing1 = 123; }
>

FAQ 37. says that we can use ## for this purpose.
	37.  I have some old code that tries to construct identifiers with a
	     macro like "#define Paste(a, b) a/**/b", but it doesn't work any
	     more.

	     A:   Try the ANSI token-pasting operator ##.
That is,

#define	APPEND(x,v)	{ donothing ## x = v; }

Hope it helps


-- 
Pyung-Chul Kim

UniSQL, Inc.
9390 Research Blvd., Kaleido II, Suite 220, Austin, TX 78759
Internet: execu!sequoia!unisql!pckim@cs.utexas.edu
UUCP: {uunet, cs.utexas.edu!execu}!sequoia!unisql!pckim
TEL: (512)343-7297 Ext. 332
FAX: (512)343-7383