So you are writing the class declaration in the header file, foo.h, like:

class foo{private://stuffpublic:foo();~foo();void blah();}

then you have the class member function difinitions in a seperate cpp file, foo.cpp, like so:

#include "foo.h"foo::foo(){//init stuff}foo::~foo(){//clean up stuff}void foo::blah(){//function stuff}

Note- you have the inclusion of foo.h that is in the projects local directory (hence "foo.h" as opposed to <foo.h>)

then you have a seperate file, say main.cpp, that has:

#include "foo.h"foo *instfoo = NULL;int main(){instfoo = new foo();//stuff}

Note- you include foo.h pointing to local directory and you create an instance of foo.

You should have this kind of setup to get modular C++ to work correctly.

They don't have to be.. could do

#include "MyFolder\Spiffy.h"

Note also that if you use global variables do it like so