%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-3-33 on page I-174 in "Customizing numerical data representation".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.0pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{siunitx}
\newcommand\sample[1]{#1:\quad \num{1e4}\hfill
                     \num{5e8}\hfill \num{1.7e0}\\[5pt]}
%StopShownPreambleCommands

\begin{document}
                                                \sample{A}
\sisetup{retain-zero-exponent,
         retain-unity-mantissa=false}           \sample{B}
\sisetup{exponent-base=2,exponent-product=\cdot}\sample{C}
\end{document}