ISO-8859-15

LaTeX:

\documentclass{article}
\usepackage[latin9]{inputenc}
\usepackage{eurosym}\def\texteuro{\euro}
\begin{document}
c½ur et 100\,¤
\end{document}

ConTeXt: first, you have to download regi-il9.tex and put it into texmf/tex/context/third/. Then:

\useregime[il9]
\enableregime[il9]
\starttext
c½ur et 100\,¤
\stoptext

Language is a form of human reason and has its reasons which are unknown to man.

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