Can I write C++ code without headers (repetitive function declarations)?

Question

Is there any way to not have to write function declarations twice (headers) and still retain the same scalability in compiling, clarity in debugging, and flexibility in desi

Answer 1

For practical purposes no, it's not possible. Technically, yes, you can. But, frankly, it's an abuse of the language, and you should adapt to the language. Or move to something like C#.