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+%%
+%% The LaTeX Companion, 3ed
+%%
+%% Example A-5-7 on page II-692 in "ifthen --- Advanced control structures".
+%%
+%% Copyright (C) 2022 Frank Mittelbach
+%%
+%% It may be distributed and/or modified under the conditions
+%% of the LaTeX Project Public License, either version 1.3c
+%% of this license or (at your option) any later version.
+%%
+%% See https://www.latex-project.org/lppl.txt for details.
+%%
+
+\documentclass{tlc3exa}
+\pagestyle{empty}
+\setcounter{page}{6}
+\setlength\textwidth{73.80075pt}
+
+ \pagestyle{origplain} % page numbers normally suppressed in examples
+ \setlength\textheight{2\baselineskip} % make this example small
+
+%StartShownPreambleCommands
+\usepackage{ifthen} \newcounter{pl}
+\newcommand\pcheck{\stepcounter{pl}\label{pl-\thepl}%
+ \ifthenelse{\isodd{\pageref{pl-\thepl}}}{odd}{even}}
+%StopShownPreambleCommands
+
+\begin{document}
+This is an \pcheck-numbered page. \newpage
+This is an \pcheck-numbered page.
+\end{document}