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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