In the latest version of XCode, Apple introduced "Storyboard" ... which bears an uncanny resemblance to Hypercard.

Part one of a Storyboard tutorial here: http://www.youtube.com/watch?v=dGdELuDMxds

For C, learn from the best, and that would be John Carmack. :)

http://doom.wikia.com/wiki/Doom_source_code_files