# Blog

## Brandon Rozek

Software Developer, Researcher, and Linux Enthusiast.

# Code alongside Output in LaTex

Published on

Updated on

2 minute reading time

Working on a tool paper, I had the desire to share code alongside its output. With a combination of the listings, caption, and color packages, we can get a result that’s nice looking.

The imports needed

\usepackage{color}
\usepackage{listings}
\usepackage{caption}


I want a think topbar that labels which column is the code section and which column is the output section.

\DeclareCaptionFormat{listing}
{\colorbox[cmyk]{0.73, 0.35, 0.15,.5}
{\parbox{\textwidth}{#1#2#3}}}
\DeclareCaptionFont{white}{\color{white}}
\captionsetup[lstlisting]{
format=listing,
labelfont=white,
textfont=white,
font={bf,footnotesize}
}


Next I define some colors that I would like to use as the theme for the code output:

\definecolor{keyblue}{rgb}{0.1, 0.1, 0.6}
\definecolor{dkgreen}{rgb}{0,0.6,0}
\definecolor{gray}{rgb}{0.5,0.5,0.5}
\definecolor{stringcol}{rgb}{0.58,0.4,0.1}


Setup for the code output

\lstset{
language=Python,
columns=flexible,
basicstyle={\small\ttfamily},
keywordstyle=\color{keyblue},
stringstyle=\color{stringcol},
breaklines=true,
breakatwhitespace=true,
tabsize=4
}


Then inside the document, you can use minipage to setup a two column layout.

% Column 1: Code
\begin{minipage}[t]{.45\textwidth}
\begin{lstlisting}[title=Code]
def factorial(n):
if n == 0:
return 1
return n * factorial(n - 1)
# Let's test it out!
print(factorial(5))
\end{lstlisting}
\end{minipage}
% Column 2: Output
\begin{minipage}[t]{.45\textwidth}
\begin{lstlisting}[title=Output]
120
\end{lstlisting}
\end{minipage}


Below is all these steps combined into a compile-able LaTex file.

\documentclass{article}
\usepackage[utf8]{inputenc}

% Imports
\usepackage{color}
\usepackage{listings}
\usepackage{caption}

% Define colors
\definecolor{keyblue}{rgb}{0.1, 0.1, 0.6}
\definecolor{dkgreen}{rgb}{0,0.6,0}
\definecolor{gray}{rgb}{0.5,0.5,0.5}
\definecolor{stringcol}{rgb}{0.58,0.4,0.1}

% Caption Setup
\DeclareCaptionFormat{listing}
{\colorbox[cmyk]{0.73, 0.35, 0.15,.5}
{\parbox{\textwidth}{#1#2#3}}}
\DeclareCaptionFont{white}{\color{white}}
\captionsetup[lstlisting]{
format=listing,
labelfont=white,
textfont=white,
font={bf,footnotesize}
}

% Code listing setup
\lstset{
language=Python,
columns=flexible,
basicstyle={\small\ttfamily},
keywordstyle=\color{keyblue},
stringstyle=\color{stringcol},
breaklines=true,
breakatwhitespace=true,
tabsize=4
}

\begin{document}

% Column 1: Code
\begin{minipage}[t]{.45\textwidth}
\begin{lstlisting}[title=Code]
def factorial(n):
if n == 0:
return 1
return n * factorial(n - 1)
# Let's test it out!
print(factorial(5))
\end{lstlisting}
\end{minipage}
% Column 2: Output
\begin{minipage}[t]{.45\textwidth}
\begin{lstlisting}[title=Output]
120
\end{lstlisting}
\end{minipage}

\end{document}


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