%%
%% The LaTeX Companion, 3ed
%%
%% Example 8-3-18 on page I-613 in "qrcode --- Generating Quick Response codes".
%%
%% 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}

%StartShownPreambleCommands
\usepackage{qrcode}
\qrset{nolink,padding,level=Q,version=5}
%StopShownPreambleCommands

\begin{document}
\qrcode[height=15mm]{# $ & ^ _ ~ % \? \\ \{ \} } \quad
\fbox{\qrcode[height=15mm]{\# \$ \& \^ \_ \~ \% \? \\ \{ \} }}
\end{document}