Adding Source Code in Latex

One of my favorite sites for quick Latex reference is Wikibook. Today I got a new package listings which can insert directly form a source code file and generate necessary formatting in Latex document. Just use the package in your Latex document file :

\usepackage{listings}

And then use the following command where you want to place code :

\lstinputlisting{myfile.cpp}

For more details see the link :
http://en.wikibooks.org/wiki/LaTeX/Packages/Listings

Also take a look in the following link for writing pseudo-code and algorithms in Latex.
http://en.wikibooks.org/wiki/LaTeX/Algorithms_and_Pseudocode