Inheriting question...

[defiler_z]

Hi ...
I have 3 classes : CBase(char *name)->C2DPoint(float x, float y)->C3DPoint(x, y, z coordinates). I have predefined all operators(+, -, *, /, +=, -=, *=, /=, <<, >>, =, copy constructor - all working properly).
In C3DPoint class I have :

C3DPoint::C3DPoint(const C2DPoint &ob) : C2DPoint(ob)

Here an example of the main() function :

int main()
{
      C2DPoint a;
      C3DPoint b;

      cout << b + a;     // working because of the method above

      cout << a + b;     // also working but i have no such method in 
                                  //C2DPoint class and the result is object 
                                  // of C2DPoint...it should be C3DPoint object
                                  // in fact , it should not work at all I think
}

I hope that I've posted the problem clearly enough ... if it isn't I can attach the files ....
Thanks in advance