%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-3-27 on page I-172 in "Complex values as numbers or in quantities".
%%
%% 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{111.0pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{siunitx}
%StopShownPreambleCommands

\begin{document}
\complexnum{1+2ie3} \\ \complexqty{2.3-3.4i}{\ohm}
\end{document}