\documentclass[french]{article}
\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\usepackage{eurosym}
\usepackage{textcomp}
\def\texteuro{\euro}

\usepackage{babel}
\begin{document}

\title{Test file for the Euro symbol : ¤}

\maketitle
It is very easy to get the euro symbol (¤) as soon
as one is able to input it at the keyboard and display it on the screen
:

\begin{itemize}
\item Set the encoding of your file to latin9 : this will convert any occurence
of the character 164 to the command \textbackslash{}texteuro
\end{itemize}
If you prefer to use the package eurosym available on CTAN (as I am
now used to), add in the latex preamble :

\begin{itemize}
\item \textbackslash{}usepackage\{eurosym\}
\item \textbackslash{}providecommand\{\textbackslash{}texteuro\}\{\textbackslash{}euro\}
\end{itemize}
and that's all : ¤¤¤\textbf{¤¤¤}\textit{¤¤¤}{\Large ¤¤¤}{\Large \par}

The package eurosym (not mandatory, of course) gives you other possibilities,
as expressing amounts according to your country uses, but I didn't
investigate these ways.
\end{document}