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\documentclass{article}
\usepackage{ntabbing,float}
\floatstyle{boxed}
\newfloat{fig}{bt}{fig}
\floatname{fig}{Figure}
\begin{document}
\title{The {\tt ntabbing} environment\thanks{The latest version of this file and the associated latex style can be found at
{\tt ftp://ftp.math.tau.ac.il/pub/stupp/latex}.}}
\author{Gideon Stupp\\ {\tt stupp@math.tau.ac.il}}
\date{April 9, 2000}
\maketitle
\begin{abstract}
The {\tt ntabbing} environment is an extension of the {\tt
tabbing} environment that supports automatic line numbering. The
lines can be referenced using the standard {\tt \string\label}
and {\tt\string\ref} mechanism.
\end{abstract}
\section{Intorduction}
\begin{fig}
\begin{verbatim}
Recursion example (Function $f$, Line~\ref{rec}).
\begin{ntabbing}
123\=123\=\kill
int $f$(int $i$)\\
\>if ($i<2$) return($i$); \label{}\\
\>return $i$*$f$($i-1$); // recurse\label{rec}\\
\\
\reset
int main()\\\
\>for $i$:=1 to 10\label{}\\
\>\>$s:=s+f(i)$;\label{}\\
\>return(s);\label{}\\
\end{ntabbing}
\end{verbatim}
Recursion example (Function $f$, Line~\ref{rec}).
\begin{ntabbing}
123\=123\=\kill
int $f$(int $i$)\\
\>if ($i<2$) return($i$); \label{}\\
\>return $i$*$f$($i-1$); // recurse\label{rec}\\
\\
\reset
int main()\\\
\>for $i$:=1 to 10\label{}\\
\>\>$s:=s+f(i)$;\label{}\\
\>return(s);\label{}\\
\end{ntabbing}
\caption{Simple {\tt ntabbing} example.\label{fig1}}
\end{fig}
Figure~\ref{fig1} shows an {\tt ntabbing} environment example and
its corresponding latex output. Every line inside the {\tt
ntabbing} environment which is labeled is automatically numbered.
The lines can be referenced from within the environment or from
the outside. If a line just needs to be numbered, {\tt
\string\label\{\}} can be used. Line numbers can be reset back to
one at any point using the {\tt\string\reset} command (line
numbering continues across {\tt ntabbing} environments)
\section{User Interface}
\reversemarginpar
\marginpar{{\tt\string\begin\{ntabbing\}}\\{\tt\string\end\{ntabbing\}}}
The text that needs to be numbered should start with {\tt\string\begin\{ntabbing\}}
and end with {\tt\string\end\{ntabbing\}}. The {\tt ntabbing} environment is an
extension of the {\tt tabbing} environment and all the tabbing
commands are supported.
\\\\\marginpar{{\tt\string\label\{\}}}
The {\tt\string\label\{\}} command automatically numbers the line with the
current sequence number. It can appear at any point in a line up to the {\tt\string\\}.
\\\\\marginpar{{\tt\string\label\{xxx\}}}
Like {\tt\string\label\{\}} but the line can be referenced using
{\tt\string\ref\{xxx\}}.
\\\\\marginpar{{\tt\string\reset}}
Resets line numbering. Line numbers can be reset several times in
the environment. Notice that line numbers are {\em
not} automatically reset at the beginning of every {\tt
ntabbing} block.
\end{document}
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