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% This macro source file is from the four volume series
% "TeX in Practice" by Stephan von Bechtolsheim, published
% 1993 by Springer-Verlag, New York.
% Copyright 1993 Stephan von Bechtolsheim.
% No warranty or liability is assumed.
% This macro may be copied freely if no fees other than
% media cost or shipping charges are charged and as long
% as this copyright and the following source code itself
% is not changed. Please see the series for further information.
%
% Version: 1.0
% Date: May 1, 1993
%
%
% This source code is documented in 3.3.13, p. I-58.
% Original source in file "reg1.TEX", starting line 1566.
\wlog{L: "imodn.tip" ["reg1.TEX," l. 1566, p. I-58]}%
% This file DOES belong to format "texip."
\catcode`\@ = 11
\newcount\@IModNCount
\newcount\@IModNCountCopy
\def\IModN #1#2#3{%
\@IModNCount = #1\relax
\@IModNCountCopy = #1\relax
\ifnum \@IModNCount < 0
\errmessage{\string\IModN: \string#1
(value \the\@IModNCount) is negative.}%
\fi
\ifnum #2< 1
\errmessage{\string\IModN: \string#2
(value #2) is negative or zero.}%
\fi
\divide\@IModNCount by #2\relax
\multiply\@IModNCount by #2\relax
#3 = \@IModNCountCopy
\advance #3by -\@IModNCount
}
\catcode`\@ = 12
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