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-% nth.sty version 2002/27/02 Donald Arseneau
-% Ordinal numbering style, 1st 2nd 3rd 4th 5th... 12th... 101st 102nd...
-%
-% (Public domain: take, include, extract, whatever)
-%
-% In LaTeX:
-% \usepackage[super,negative]{nth}
-% where option [super] gives superscript `th'
-% and option [negative] allows ``st, nd, rd'' suffixes on negative numbers.
-%
-% example: \renewcommand{\thesection}{\ordinal{section}}
-% or \renewcommand{\thesection}{\@ordinal\c@section}
-% or \renewcommand{\thesection}{\nth\c@section}
-%
-% In plain TeX:
-% \input nth.sty
-% use: \nth{<number>}.
-% Change formatting by redefining \nthscript and \nthtest
-
-\def\nth#1{% First print number:
- \expandafter\nthM \number #1\relax
- \nthscript{%
- \ifnum#1\nthtest0 th\else % negatives are all ``th'' (depending on \nthtest)
- \expandafter \nthSuff \expandafter 0\number\ifnum #1<0-\fi#1\delimiter
- \fi
- }}
-
-% Minus sign using math mode:
-\def\nthM#1{\if -#1\ifmmode-\else$-$\fi\else #1\fi}
-
-% Print suffix depending on last two digits:
-\def\nthSuff#1#2#3{%
- \ifx \delimiter#3% #1#2 are last two digits
- \ifnum #1=1 th% teens are always ``th''
- \else % use appropriate suffix
- \ifcase #2 th\or st\or nd\or rd\else th\fi
- \fi
- \else % continue scanning for last two digits
- \expandafter \nthSuff \expandafter #2\expandafter #3%
- \fi}
-
-% Formatting hook for ordinals (\let\nthscript\textsuperscript)
-\def\nthscript#1{#1}% alternate: \def\nthscript#1{$\rm^{#1}$}
-
-% Formatting hook for all negative numbers giving ``th''
-\def\nthtest{<} % alternate: \def\nthtest{=}
-
-\ifx\Alph\undefined\else
- \def\ordinal#1{\expandafter\@ordinal\csname c@#1\endcsname}
- \let\@ordinal\nth
- \ProvidesPackage{nth}[2002/02/27]
- \DeclareOption{super}{\def\nthscript{\textsuperscript}}
- \DeclareOption{negative}{\def\nthtest{=}}
- \ProcessOptions
-\fi
-