%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-2-45 on page I-324 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{207.0pt}

%StartShownPreambleCommands
\usepackage{listings}
\lstloadlanguages{C,Ada}
\lstset{language=C,commentstyle=\scriptsize}
%StopShownPreambleCommands

\begin{document}
A ``for'' loop in C:
\begin{lstlisting}[keywordstyle=\underbar]
int sum;
int i; /*for loop variable*/
sum=0;
for (i=0;i<n;i++) { sum += a[i]; }
\end{lstlisting}
Now the same loop in Ada 83:
\begin{lstlisting}[language={[83]Ada}]
Sum: Integer;
-- no decl for `I' necessary
Sum := 0;
for I in 1..N loop
  Sum := Sum + A(I);
end loop;
\end{lstlisting}
\end{document}