How can I prepare source code listings?

• Q How can I prepare source code listings?
• A \usepackage{listings} See also http://www.ctan.org/tex-archive/macros/latex/contrib/listings/listings.pdf

  
  \usepackage{listings}
  \usepackage{bold-extra}
  \lstset{
  language=PASCAL,
  basicstyle=\scriptsize,
  columns= fullflexible
  }

\begin{lstlisting} \end{lstlisting)

For Smalltalk code, use
[st80.tex](https://www.iam.unibe.ch/scg/svn_repos/scgbib/LatexTemplates/st80.tex).
Demo usage:
[st80demo.tex](https://www.iam.unibe.ch/scg/svn_repos/scgbib/LatexTemplates/st80demo.tex)