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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 27.1.4.1, p. III-404.
+% Original source in file "macros7.TEX", starting line 400.
+\wlog{L: "hex.tip" ["macros7.TEX," l. 400, p. III-404]}%
+% This file DOES belong to format "texip."
+\def\Hex #1{%
+ {%
+ \count0 = #1%
+ \count1 = #1%
+ \divide\count0 by 16
+ \count2 = \count0
+ \multiply \count2 by -16
+ \advance \count1 by \count2
+ \ifnum \count0 > 0
+ \Hex{\count0}%
+ \fi
+ \HexDigit{\count1}%
+ }%
+}
+\def\HexDigit #1{%
+ {%
+ \count0 = #1\relax
+ \ifnum \count0 < 10
+ \number\count0 % or \the\count0
+ \else
+ \advance\count0 by -10
+ \advance\count0 by `A
+ \char\count0
+ \fi
+ }%
+}