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+%%
+%% The LaTeX Companion, 3ed
+%%
+%% Example A-5-1 on page II-687 in "calc --- Arithmetic calculations".
+%%
+%% 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{135.0pt}
+%StartShownPreambleCommands
+\usepackage{csquotes,calc}
+\newcounter{private}
+\setcounter{private}{2} % initial setting for the example
+%StopShownPreambleCommands
+
+\begin{document}
+The value is currently \enquote{\theprivate}.\\
+\setcounter{private}{\value{private}*2 + 5}
+The value has now changed to \enquote{\theprivate}.
+\end{document}