floating point numbers crash \numberstringnum

[vv01f]

used in German language here would expect \numberstringnum{31,50} to return "einunddreißig komma fünfzig" ("thirtyone point fifty") for currency or "einunddreißig komma fünf null" ("thirtyone point fife zero") for e.g. measures any solution I missed?

[nlct]

The commands provided by fmtcount all require integer values. (They're primarily provided for use with counters, which use integer registers.) There's no support for floating point numbers.

[vv01f]

then maybe you can make it give a nicer hint or error message what went wrong in case someone like me tries to abuse the package :)

[nlct]

Unfortunately TeX doesn't really have a concept of type checking. The same problem occurs with other commands that require an integer. For example, with the following:

\documentclass{article}

\begin{document}

\newcounter{test}
\setcounter{test}{2.5}
Counter: \thetest.

\end{document}

there's no error message, but a spurious .5 appears in the document. Whereas

\documentclass{article}

\newcounter{test}
\setcounter{test}{2.5}

\begin{document}
Counter: \thetest.
\end{document}

produces the somewhat puzzling message ! LaTeX Error: Missing \begin{document}. (Because of the spurious .5.)

The \numberstring / \numberstringnum commands are all analogous to LaTeX's \roman / \@roman commands which likewise require integers, but don't perform any checking that the argument is actually an integer register / number.

I think the best thing to do is to clarify in the manual that by "number" we mean an integer number.

[vincentb1]

What you wrote is correct for the German language implementation which uses counters under the hood. But for the French language I have redesigned the implementatkion based on fcnumparser.sty, and it has the possibility to detect decimal separator, even though currently formatting decimal number is not supported.

Anyhow, I am still too busy with other items…