Really really simple question about member functions in classes

I mean really really simple.

All i want to do is make a class (in Visual C++ 2008) A  that has two int members b and c, and a function d  that adds them together. What i wrote is this:

-------------------A.h--------------------------
#ifndef A_H
#define A_H
#pragma once

class A
{
public:
      int b;
      int c;
      int d();
};
#endif
------------------------------------------------

-----------------A.cpp-------------------------
#include "A.h"

int d()
{
      int r = b + c;
      return r;
}
---------------------------------------------------

With this it tells me that in A.h, b and c are undeclared identifiers.
With A::b and A::c in A.h instead of just b and c it says "error C2597: illegal reference to non-static member 'A::b'" and i don't want them to be static members.

Anyone tell me what the correct method of doing this is?

Thanks a lot for your help.
James