How to insert source code into a latex document.
listings
First method: use listings package
Package
\usepackage{listings}
Usage
\lstset{language=c}
\lstset{caption=Some caption}
\lstset{captionpos=b} // caption at bottom, default to top
\lstinputlisting{some source code.c}
For short code:
\begin{lstlisting}
Your source code here
\end{lstlisting}
