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From: jeffrey@cs.chalmers.se (Alan Jeffrey)
Newsgroups: comp.text.tex
Subject: Re: (Another) puzzler for wannabe wizards
Keywords: Dirty Tricks, catcode changing, puzzle
Message-ID: <4652@undis.cs.chalmers.se>
Date: 6 Jun 91 12:34:48 GMT
References: <RAICHLE.91Jun5125624@azu.informatik.uni-stuttgart.de> <4651@undis.cs.chalmers.se>
Distribution: comp
Organization: Dept. of CS, Chalmers, Sweden
Lines: 14

Bernd pointed out that my solution to his puzzler broke down if " had
a catcode of \active... this was due to me misreading the question,
naughtly me...  Anyway, the `correcter' solution is:

      \expandafter\Swap\expandafter{\the\catcode`\"}
         {\catcode`\"=\active\Swap}
         {\def"#1#2{\catcode`\"#1\def"{#2}}\catcode`\"=12 "}"

Have a nice day y'all...

Alan.
-- 
Alan Jeffrey         Tel: +46 31 72 10 98         jeffrey@cs.chalmers.se
Department of Computer Sciences, Chalmers University, Gothenburg, Sweden