Hello, I am working on a project that I feel will be rather big, so instead of having all my code in one huge cpp file I wish to split the cpp files so that one cpp file handles one set of functions, and another cpp file handles another set of functions.

I really am clueless how to do this. When I tried at first to add cpp files, then I get the error message that some of my global variables have not been declared.

What is the best and most organized way of solving my problem? Any help will be appreciated.

Thanks.