Get both the chapter and section of a referenced section

Question

I have chapters numbered with roman numerals and sections numbered with arabic numbers (starting from 1 for each new section, i.e. section I.3, section II.3, section III.3 - and so on - are all just displayed as "section 3").

I had to format my thesis in this way to comply to the guidelines of the Faculty and I did that by including these line in the preamble:

\renewcommand{\chaptername}{Capitolo}
\renewcommand{\thechapter}{\Roman{chapter}}
\renewcommand*\thesection{\arabic{section}}

Yet, given that - for example - section II.3 is labelled \label{sec:chap2sec3}, I'd like to have in the text something like "see section II.3" when in the code I write "see section \ref{sec:chap2sec3} (instead of just "see section 3" as I get at the moment).

What would be the easiest way to achieve this? Thanks in advance!

Answer 1

Here's the quick and dirty method, by changing the \p@section reference formatting macro to be prepended with \thechapter. and combining it with cleveref.

Note: \setcounter{section}{100} is just for testing purposes.

\documentclass{book}


\renewcommand{\chaptername}{Capitolo}
\renewcommand{\thechapter}{\Roman{chapter}}
\renewcommand*\thesection{\arabic{section}}

\makeatletter
\renewcommand{\p@section}{\thechapter.}
\makeatother

\usepackage{cleveref}


\begin{document}

See \cref{Foosection} for more information

\chapter{Other chapter}

\chapter{Foo} 

\setcounter{section}{100}
\section{Foo section} \label{Foosection}

\end{document}

Update The version without cref

\documentclass{book}


\renewcommand{\chaptername}{Capitolo}
\renewcommand{\thechapter}{\Roman{chapter}}
\renewcommand*\thesection{\arabic{section}}

\makeatletter
\renewcommand{\p@section}{\thechapter.}
\makeatother

\begin{document}

See \ref{Foosection} for more information

\chapter{Other chapter}

\chapter{Foo} 

\setcounter{section}{100}
\section{Foo section} \label{Foosection}

\end{document}