Inheritance question!!!!

[wlhaha]

Hi im new at c++, could anyone help me on this?

#include <iostream>

using namespace std;

class A
{
	public:
			int q;
			A(int q = 0){ this->q = q;}
};

class B: virtual public A
{
	public:
			int r;
			B(int q = 0, int r = 0):A(q){this -> r = r;};
			
};


class C
{
	public:
		A sum;
		C(A stuff){sum = stuff;}
				
};


class D: virtual public C
{
	public:
		B sum2;
		D(B stuff2): C(A(stuff2.q)){sum2 = stuff2;}
};


int main()
{
	A one(5);
	B two(4,5);
	C three(one);
	D four (two);
	
	cout << four.sum2.q << endl; // 4
	cout << four.sum.q << endl; // 4
	
	four.sum2.q = 6;
	cout << four.sum2.q << endl; //6
	cout << four.sum.q << endl; //4
	
	four.sum.q = 7;
	cout << four.sum2.q << endl; //6
	cout << four.sum.q << endl; //7
}

How do I write the code such that there is only 1 class A item in D?

[helios]

What do you mean? You want D::sum2 to refer to the same object as C::sum? If that's the case, you could do

B &sum2;
D(/*...*/):sum2(this->sum)//... 

Needless to say, this is only possible because C::sum is an A and D::sum2 is a B. If the types were swapped, this would not work.