Computer Language

What language are the programs written in? I have a student who asked me for a programming book because he is having trouble figuring out some code for a game he is creating. I teach Visual Basic. I don’t know if the books I have will be of any use to him or where I can lead him for help. Thank you.

http://unity3d.com/support/documentation/Manual/Scripting.html

Unity itself is written in C++, scripting is done through Mono with either C#, JS or Boo.