XCode as a debugger, tutorial? I've never used debuggers, except for occasionally GDB's backtrace to find a segfault.  I'm currently working with a moderate sized C hydrodynamics code, where I think it might be time to start using a nice GUI debugger instead of sticking fprintf statements everywhere.

Can anyone point me towards a good getting started tutorial on using XCode (10.7) as a debugger for a C project?
Is the code already setup as an XCode project? If yes, this question has already been answered: Where is there a good tutorial on how to use Xcode's debugger properly? Admitted, most links are dead by now. But google comes up with a lot of useful links, even video.