覆盖

#include <iostream>
using namespace std;

class A
{
protected:
	int m;
public:
	A(int d=0){m=d;}
	int GetD(){return doGetD();}
	virtual int doGetD(){return m;}
};

class B:public A
{
protected:
	int m;
public:
	B(int d=1){m=d;}
	int doGetD(){return m;}
};

class C:public B
{
protected:
	int m;
public:
	C(int d=1){m=d;}
};

int main()
{
	C c(100);
	cout<<c.GetD()<<endl       
		<<c.A::GetD()<<endl
		<<c.B::GetD()<<endl
		<<c.C::GetD()<<endl
		<<c.A::doGetD()<<endl
		<<c.B::doGetD()<<endl
		<<c.C::doGetD()<<endl;
	return 0;
}