%%
%% Der LaTeX-Begleiter, zweite Auflage (September 2005)
%%
%% Beispiel A-3-3 von Seite 906.
%%
%% Copyright (C) 2005 Frank Mittelbach, Michel Goossens,
%%    Johannes Braams, David Carlisle, and Chris Rowley
%%
%% Uebersetzung: Copyright (C) 2005 Claudia Krysztofiak,
%%    Rebecca Stiels und Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%

\documentclass{lb2exareport}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{101.4372pt}
\setcounter{chapter}{1}
\setcounter{section}{3}
% einige Werte für das Beispiel:

\StartShownPreambleCommands
\usepackage{ifthen}
\newcommand\toEng[1]{\arabic{#1}\textsuperscript{%
 \ifthenelse{\value{#1}=1}{st}{%
  \ifthenelse{\value{#1}=2}{nd}{%
   \ifthenelse{\value{#1}=3}{rd}{%
    \ifthenelse{\value{#1}<20}{th}}%
                              {\typeout{Zu hoher Wert}}}}}}
\StopShownPreambleCommands
\begin{document}
This is the \toEng{section} section in the \toEng{chapter}
appendix.
\end{document}