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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 3.3.14, p. I-60.
+% Original source in file "reg1.TEX", starting line 1659.
+\wlog{L: "valdecpo.tip" ["reg1.TEX," l. 1659, p. I-60]}%
+% This file DOES belong to format "texip."
+\InputD{imodn.tip}
+\InputD{absval.tip}
+\InputD{rangetst.tip}
+\InputD{doloop.tip}
+\catcode`\@ = 11
+\newcount\@ValueOfDecimalPosition
+\newcount\@ValueOfDecimalPositionLoopCount
+\def\ValueOfDecimalPosition #1#2#3{%
+ \CheckRange{#2}{0}{9}{\string\ValueOfDecimalPosition:
+ \#2 must be in the range 0 .. 9}%
+ \AbsoluteValue{#1}{\@ValueOfDecimalPosition}%
+ \DoLoop{\@ValueOfDecimalPositionLoopCount}{1}{1}{#2}%
+ {\global\divide\@ValueOfDecimalPosition by 10}%
+ \IModN{\@ValueOfDecimalPosition}{10}{#3}%
+}
+\catcode`\@ = 12