C++ is just the next iteration of C.

This is somewhat clever when you know that the ‘++’ operator is the post-increment operator in C.

C# is just another layer of iteration on top of C++.

…except there is no ‘#’ operator in C or C++, so any interesting self-referential pattern breaks down here. The ‘#’ comes from musical notation, where a ‘#’ (sharp) note is played a semitone higher — and was chosen more for marketing purposes rather than scientists having an inside joke.

You could have also mentioned ‘D’, which is another “next iteration of C” independent of C++.