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+
+% ziffer.sty v2.1
+%
+% Author:
+%
+% M. V\"ath vaeth@mathematik.uni-wuerzburg.de
+%
+%
+% This package provides the macros
+% \ZifferAn (equivalent with \ZifferPunktAn \ZifferStrichAn )
+% \ZifferAus (equivalent with \ZifferPunktAus\ZifferStrichAus)
+% \ZifferPunktAn
+% \ZifferPunktAus
+% \ZifferStrichAn
+% \ZifferStrichAus
+%
+% If \ZifferAn was used, then in numbers in math-mode the following happens:
+% `.' is used as a `one-thousand separator' as common in Germany
+% `,' is used as a decimal separator as common in Germany
+% `--' generates a -- with better spacing (e.g. in 1.000,-- )
+%
+% You may still use the symbols `.' `,' and `-' in other context in math mode.
+%
+% The first two conversions are switched on by default, the last conversion has
+% to be switched on explicitly (this has been changed in v2.1):
+% You may switch on/off the conversions with
+% \ZifferPunktAn/\ZifferPunktAus (for the first two conversions) respectively
+% \ZifferStrichAn/\ZifferStrichAus (for the last conversion).
+%
+% The reason why the last conversion is not on by default (and why it might be
+% necessary to [temporarily] switch off a conversion) is that certain packages
+% (in particular, newer versions of amsmath) cause problems with it.
+%
+% There were some discussions which should be the correct output of the
+% above conversions (in particular, of `--').
+% If you do not like my choice: You may customize (i.e. redefine) the macros
+% \ZifferLeer and \ZifferStrich
+% after loading the package to produce the `one-thousand separator'
+% respectively the `--'.
+%
+% All above command-names are in German, because I had expected that this
+% package is only needed for German texts. Meanwhile, I learned that also
+% other countries use this strange convention for numbers. However, for
+% downward compatibility, I decided to keep the name conventions anyway
+% (after all, the name of the package is in German anyway).
+
+\ifx\newcommand\undefined\else
+ \newcommand{\ZifferAn}{}
+ \newcommand{\ZifferAus}{}
+ \newcommand{\ZifferPunktAn}{}
+ \newcommand{\ZifferPunktAus}{}
+ \newcommand{\ZifferStrichAn}{}
+ \newcommand{\ZifferStrichAus}{}
+ \newcommand{\ZifferLeer}{}
+ \newcommand{\ZifferStrich}{}
+\fi
+
+\def\ZifferAn{\ZifferPunktAn\ZifferStrichAn}
+\def\ZifferAus{\ZifferPunktAus\ZifferStrichAus}
+\def\ZifferPunktAn{\mathcode`,="8000\mathcode`.="8000\relax}
+\def\ZifferPunktAus{\mathcode`,="613B\mathcode`.="013A\relax}
+\def\ZifferStrichAn{\mathcode`-="8000\relax}
+\def\ZifferStrichAus{\mathcode`-="2200\relax}
+\def\ZifferLeer{\phantom{.}}
+\ifx\textrm\undefined
+ \def\ZifferStrich{\hbox{-\kern0.1em-}}
+\else
+ \def\ZifferStrich{\textrm{-\kern0.1em-}}
+\fi
+
+\mathchardef\ziffer@CommaMy="013B
+\mathchardef\ziffer@CommaOri="613B
+\mathchardef\ziffer@DotOri="013A
+\mathchardef\ziffer@MinusOri="2200
+{\ZifferAn
+ \catcode`\,=\active\gdef,{\begingroup\obeyspaces\futurelet\n\ziffer@ccheck}
+ \catcode`\.=\active\gdef.{\begingroup\obeyspaces\futurelet\n\ziffer@dcheck}
+ \catcode`\-=\active\gdef-{\begingroup\obeyspaces\futurelet\n\ziffer@mcheck}}
+\def\ziffer@ccheck{\ziffer@check\ziffer@CommaMy\ziffer@CommaOri}
+\def\ziffer@dcheck{\ziffer@check\ZifferLeer\ziffer@DotOri}
+\def\ziffer@mcheck{\ifx\n-\def\n-{\endgroup\ZifferStrich}%
+ \else\def\n{\endgroup\ziffer@MinusOri}\fi\n}
+\def\ziffer@check#1#2{%
+ \ifx\n1\endgroup#1\else
+ \ifx\n2\endgroup#1\else
+ \ifx\n3\endgroup#1\else
+ \ifx\n4\endgroup#1\else
+ \ifx\n5\endgroup#1\else
+ \ifx\n6\endgroup#1\else
+ \ifx\n7\endgroup#1\else
+ \ifx\n8\endgroup#1\else
+ \ifx\n9\endgroup#1\else
+ \ifx\n0\endgroup#1\else
+ \endgroup#2%
+ \fi
+ \fi
+ \fi
+ \fi
+ \fi
+ \fi
+ \fi
+ \fi
+ \fi
+ \fi}
+\ZifferPunktAn