%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-2-50 on page I-326 in "listings --- Pretty-printing program code".
%%
%% 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{183.0pt}

\begin{filecontents*}{pascal.src}
for i:=1 to maxint do
begin
  WrItE('This is stupid');
end.
\end{filecontents*}
%StartShownPreambleCommands
\usepackage{listings}
% pascal.src as defined before
%StopShownPreambleCommands

\begin{document}
\lstset{numberstyle=\tiny,numbers=left,
   numbersep=5pt,
   firstnumber=9,stepnumber=2,numberfirstline,
   xleftmargin=12pt,showstringspaces=false}
\noindent Some text before \ldots
\lstinputlisting[language=Pascal]{pascal.src}
\end{document}