适合初学者学习以及程序员回顾

				// B&D2.h
				#include 
				using namespace std;
				
				//---- 宣告类别 Base --------
				
				class Base
				{
				 private:
				   int i;
				 public:
				   Base():  i(3)
				     {cout 				   Base(int N): i(N)
				     {cout 				   ~Base()
				     {cout 				   void Set(int N)  {i=N;}
				   int  Get() const {return i;}
				   void Double()    {i*=2;}
				   void Triple()    {i*=3;}
				};
				
				//---- 宣告类别 Derived --------
				class Derived : public Base
				{
				 private:
				   int i;
				 public:
				   Derived(): i(5)
				     {cout 				   Derived(int M, int N) : Base(M), i(N)
				     {cout 				   ~Derived()
				     {cout 				   void Set(int N)      {i=N;}
				   void SetBase(int N)  {Base::Set(N);}
				   void Double()    {i*=2;}
				   int  Get()     const {return i;}
				   int  GetBase() const {return Base::Get();}
				};