Online Tutorial For Learning C++/Challenge 64

Like the C one a couple of days ago (and very similar!), I've also rebooted the C++ tutorials, to be run online. They start off similar but will diverge very quickly.

Also I've started marking the Sum Some challenge 64 and the first few results are up. More to follow tomorrow night. There's one very fast entry so far, the only C++ one, the rest are in C#.

• Link to new online C++ programming tutorial
• Enter Challenge 64