Re: Concatenating tokens that aren't parameters, in ANSI C

Article View: comp.std.c

Article #5238

#5238

From: ~XT4103000~Marc Mengel~C25~G25~6...
Date: Wed, 27 Jul 1988 14:54

33 lines
1186 bytes

In article <4963@hoptoad.uucp> gnu@hoptoad.uucp (John Gilmore) writes:
[old code breaks under ANSI cpp follows]
>#define LFD 6
>#define LHIGH 1.0e+LFD
>which expanded to
>1.0e+6
 [tried]
>#define LHIGH 1.0e+ ## LFD
 [and also]
>#define cat_a(a,b) a ## b
>#define cat_b(a,b) a ## b
>#define LHIGH cat_a(1.0e+,cat_b(LFD,))
>
>should work, but it produces:
>
>1.0e+cat_b(6 ,)  

Hmmm. seeems like maybe
#define LFD	6
#define BASE	1.0e
#define LHIGH	LFD+BASE

might just work, I don't have a gcc cpp handy to test it though. (It
works under SysV cc.

>John Gilmore    {sun,pacbell,uunet,pyramid,amdahl}!hoptoad!gnu    gnu@toad.com


-- 
 Marc Mengel			       
				
 attmail!mmengel	
 {lll-crg|mtune|ihnp4}!cuuxb!mmengel

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!attcan!uunet!husc6!rutgers!att!cuuxb!mmengel
From: mmengel@cuuxb.ATT.COM (~XT4103000~Marc Mengel~C25~G25~6184~)
Newsgroups: comp.std.c
Subject: Re: Concatenating tokens that aren't parameters, in ANSI C
Message-ID: <1946@cuuxb.ATT.COM>
Date: 27 Jul 88 14:54:36 GMT
References: <4963@hoptoad.uucp>
Reply-To: mmengel@cuuxb.UUCP (PUT YOUR NAME HERE)
Organization: AT&T, Data Systems Group, Lisle, IL
Lines: 33

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