exe11.5.cpp

这是C++的一部分练习程序!对初学者有一定的帮助作用。

#include <iostream.h>
class A
{
  public:
	A()
	{  cout<<"In A cons.\n";  }
	virtual ~A()
	{  cout<<"In A des.\n";  }
	virtual void f1()
	{  cout<<"In A f1().\n";  }
	void f2()
	{  f1();  }
};
class B:public A
{
  public:
	B()
	{  f1();cout<<"In B cons.\n";  }
	~B()
	{  cout<<"In B des.\n";  }
};
class C:public B
{
  public:
	C()
	{  cout<<"In C cons.\n";  }
	~C()
	{  cout<<"In C des.\n";  }
	void f1()
	{  cout<<"In C f1().\n";  }
};

void main()
{
	A *pa=new C;
	pa->f2();
    delete pa;
}