#include <iostream.h>
class A
{public:
A()
{cout<<"As cons."<<endl;}
virtual ~A()
{cout<<"As des."<<endl;}
virtual void f()
{cout<<"As f()."<<endl;}
void g()
{f();}
};
class B:public A
{public:
B()
{f();cout<<"Bs cons."<<endl;}
~B()
{cout<<"Bs des."<<endl;}
};
class C:public B
{public:
C()
{cout<<"Cs cons."<<endl;}
~C()
{cout<<"Cs des."<<endl;}
void f()
{cout<<"Cs f()."<<endl;}
};
void main()
{A *a=new C;
a->g();
delete a;
}
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