How to add an appendix to an article? [closed]

Question

I need to add an appendix in an article I'm writing, but I don't really know how to do it. Can somebody explain to me what is the proper way to add it?

Answer 1

The command \appendix is included in all basic class files:

\documentclass[a4paper]{article}

\begin{document}

\section{Test 1}
\section{Test 2}

% Activate the appendix
% from now on sections are numerated with capital letters
\appendix

\section{Test 3}
\section{Test 3}
\end{document}