minipage layout not correct

Question

I want to generate a document with graph at left and tikz code at the right. I try to use two minipage but it seems it always layout it as up and down. The minipage is 0.45\textwidth, why latex still can not put it side by side?

The example code as below:

\documentclass[12pt]{article}
\usepackage[margin=0.5in]{geometry}
\usepackage{listings}
\usepackage{color}
\usepackage{tikz}
\usepackage{adjustbox}

\lstset{
backgroundcolor=\color{white},
breaklines=true,
language=TeX,
frame=single}

\begin{document}

\begin{minipage}{0.45\textwidth}
  \begin{adjustbox}{max width=0.45\textwidth}
    \begin{tikzpicture}
      \draw (0,0) circle (5cm);
    \end{tikzpicture}
  \end{adjustbox}
\end{minipage}

\begin{minipage}{0.45\textwidth}
  \begin{lstlisting}
    \begin{tikzpicture}
      \draw (0,0) circle (5cm);
    \end{tikzpicture}
  \end{lstlisting}
\end{minipage}

\end{document}

Current output by pdflatex as bleow:

Answer 1

You should consider using the showexpl package and use the LTXexample environment.

If you wish to have the code in an external file use the \LTXinputExample environment instead as the second example does in the MWE.

Notes:

• The filecontents package was used to set up a file to read for this test case. It is not needed in you actual use case.

Code:

\documentclass[12pt]{article}
%\usepackage{filecontents}% <-- Commented to prevent overwrite of test.tex
\begin{filecontents}{test.tex}
    \begin{tikzpicture}
      \draw [ultra thick, blue] (0,0) circle (2.5cm);
    \end{tikzpicture}
\end{filecontents}
\usepackage[margin=0.5in]{geometry}
\usepackage{tikz}
\usepackage{showexpl}
\lstset{
    backgroundcolor=\color{white},
    breaklines=true,
    language=TeX,
    frame=single,
}
\begin{document}
\begin{LTXexample}[
        width=0.6\linewidth, 
        backgroundcolor=\color{yellow!40},
        basicstyle=\small\ttfamily,
        numbers=none
    ]
    \begin{tikzpicture}
      \draw [ultra thick, blue] (0,0) circle (2.5cm);
    \end{tikzpicture}
\end{LTXexample}
\LTXinputExample[
        width=0.6\linewidth, 
        backgroundcolor=\color{green!40},
        basicstyle=\small\ttfamily,
        numbers=none,
    ]{test}
\end{document}