Did you check your handy C++ library reference? Because it's all explained there, and a more specific question than "can you tell me everything I want to know?" is likely to encourage high quality...

>Is this a right way of defining it?
Every way is the right way as long as it compiles and does what you want. Your question can't be answered as asked.

>How do I Modify a file?
You read the...

>all the compiler did was re-compile endlessly a hundred times or so
A hundred times or so isn't quite endless. Generally it's not recommended that you include .cc files. The conventional method is...