example23.tex

\documentclass[openany]{book}
\usepackage{lipsum}
\usepackage{chappg}
\renewcommand{\chappgsep}{--}
\usepackage{boxedminipage}
\usepackage{fancyhdr}
\pagestyle{fancy}
\begin{document}

\pagenumbering{roman}
\tableofcontents
\bigskip

\noindent
\begin{boxedminipage}{\textwidth}
This is example 23 in the fancyhdr documentation.

We use the page number style ``n--m'' where ``n'' is the chapter number and ``m'' is the page number (relative to the current chapter). 
This is done using the \texttt{chappg} package. In the front matter (Table of Contents), we use small roman numerals.

\begin{verbatim}
\usepackage{chappg}
\renewcommand{\chappgsep}{--}
 . . .
\clearpage
\pagenumbering{bychapter}
\end{verbatim}
\end{boxedminipage}

\clearpage
\pagenumbering{bychapter}
\chapter{Introduction}

\lipsum

\section{The Problem}

\lipsum[1]

\section{Evaluation}

\lipsum

Some more text.

Some more text.

Some more text.

Some more text.

\chapter{Another chapter}

\lipsum[2]

\section{Another section}

\lipsum[3-5]

\end{document}