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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 25.1.9, p. III-328.
+% Original source in file "macros5.TEX", starting line 668.
+\wlog{L: "rangetst.tip" ["macros5.TEX," l. 668, p. III-328]}%
+% This file DOES belong to format "texip."
+\catcode`\@ = 11
+\newif\if@InRange
+\def\InRangeConditional #1#2#3{%
+ TT\fi
+ \@InRangetrue
+ \ifnum #1<#2\relax
+ \@InRangefalse
+ \fi
+ \ifnum #1>#3\relax
+ \@InRangefalse
+ \fi
+ \if@InRange
+}
+
+\def\CheckRange #1#2#3#4{%
+ \ifnum #1 < #2\relax
+ \errmessage{Value \number#1 \space out of range #2..#3: #4}%
+ \fi
+ \ifnum #1>#3\relax
+ \errmessage{Value \number#1 \space out of range #2..#3: #4}%
+ \fi
+}
+\def\CheckZeroOneRange #1#2{%
+ \CheckRange{#1}{0}{1}{#2}%
+}
+\catcode`\@ = 12