Alot of ignorant people claim that you need to know C before learning C++.
This is a load of bullshit. It would just be dumb to learn C before C++, since the structures are different. And many things that you've practised on in C is totally different in C++, so you may get really confused.
Im not saying that your not able to learn C++ if you already know C. Infact it might be somewhat of an advantage.
But you dont need to know it.
