本人初学C++，不太懂，有两个小程序就读懂，请高手帮忙读一下，最好能给出输出结果和讲解一下！谢谢！
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;
}

#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;
    }
注意大小写.还有就是实例化对象的时候顺序问题,先基类,再子类,释放时候,顺序相反

后一个是动态编连里面的概念.虚函数,用指针做的,还有用对象应用也可以实现.你暂时可以把基础先看好...