I may be interpreting you incorrectly, but the amount of hostility seems a little much.
I've read and practised a reasonable amount of C++ from the ground up.
All I'm asking is how to have a class in a different file, as doing it in the way suggested by other threads appears to throw an error.
I will put some simple code together momentarily, to demonstrate the issue (my actual sketch is way lengthier than needed to demonstrate the issue).