Well, Apple doesn't only write Objective-C. I'd bet a majority of the code they write is plain C and C++ for internal OSX stuff. And some of their major project

Well, Apple doesn't only write Objective-C. I'd bet a majority of the code they write is plain C and C++ for internal OSX stuff. And some of their major projects are still Carbon (C++) (though they are trying to port to Cocoa).