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1¡¢
#include<iostream.h>
class A
  {public: A(){cout<<"A";}
           ~A(){cout<<"~A";}};
class B: public A
  {public:  B(){cout<<"B";}
           ~B(){cout<<"~B";}
           };
class c:public B
{public:  c(){cout<<"c";}
          ~C(){cout<<"~C";}
  private: Am; Bn;
  };
  A obj;
int main()
{  C*P=new C;  cout<<endl;
    B obj;   cout<<endl;
    delete P; cout<<endl;
    return 0;
    }


2¡¢

#include<iostream.h>
class A {public: virtual void output() {cout<<"class A\n";}};
class B:public A {viod output() {cout<<"class B\n";}};
class C:public A {void output() {cout<<"class C\n";}};
class D:public C { Cm;};
class E:public B{void output() {cout<<"class E\n";} Bm;};
int main()
{ Aa;Bb;Cc;Dd;Ee;
   A*P[]={&a,&b,&c,&d,&e};
   A v[]={a,b,c,d,e};
   for (int i=0;i<5;i++)    {P[ i ] ->output();v[ i ].output();}
   return 0;
}

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#include<iostream.h>
class A
  {public: A(){cout<<"A";}
           ~A(){cout<<"~A";}};
class B: public A
  {public:  B(){cout<<"B";}
           ~B(){cout<<"~B";}
           };
class c:public B
{public:
c(){cout<<"C";}
~c(){cout<<"~C";}
  private: int Am;
           int Bn;
  };
// A obj;
int main()
{  c *P=new c;  cout<<endl;
    B obj;   cout<<endl;
    delete P; cout<<endl;
    return 0;
    }
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