In the first post the problem was that m_speed is not public also u should
access m_speed using Scope resolution operator as m_speed is not a member of
B.
class A
{
public:
virtual int speed()=0;
int m_speed;
};
class B:public A
{
public:
int speed()
{
return A::m_speed;
}
};
For ur second question...

int main()
{
A *aptr=new B;
cout<<aptr->speed();
return 0;
}

I hope ur not clear with the concept of virtual functions... This example
will help you. If not post back ur questions...

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