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From: raichle@informatik.uni-stuttgart.de (Bernd Raichle)
Newsgroups: comp.text.tex
Subject: Re: (Another) puzzler for wannabe wizards
Message-ID: <RAICHLE.91Jun7124216@azu.informatik.uni-stuttgart.de>
Date: 7 Jun 91 10:42:16 GMT
References: <RAICHLE.91Jun5125624@azu.informatik.uni-stuttgart.de>
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Organization: Informatik, Univ. Stuttgart. W.Germany
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In-reply-to: raichle@informatik.uni-stuttgart.de's message of 5 Jun 91 10:56:23 GMT

I wrote:
> This re-definition should satisfy the following constraints:
> - do not assume that the catcode of " is 12

To be more precise, better use this to check your solution:

% ------- CUT HERE ------
% use plainTeX
\catcode`\"=\active\gdef"{\"}
T"ater                     % output: T\"ater
\begingroup\catcode`\"=6   % (or another value 0..15)
  \showthe\catcode`\"      % print:  6
  % @<Insert your hack at this place@>
  \showthe\catcode`\"      % print:  6
  \catcode`\"=12
  T"ater                   % output: T''ater
  \catcode`\"=\active
  T"at\char"65 r           % output: T''ater
\endgroup
T"ater                     % output: T\"ater
\bye
% ------- CUT HERE ------


Have a nice weekend (;-)
  -bernd