C/C++程序设计导论（第二版）》程序源文件

				// pnode.h  Definition of a Pnode class
				
				//#include "person.h"
				typedef char Person;					// temporary for debugging
				const Person HEADPERSON = ' ';
				const Person TAILPERSON = '~';
				
				class Pnode
				{	public:	 Pnode ();								// constructor
								 friend class PersonList;			// PersonList is our friend
					private:	 Pnode *link;
								 Person person;
				};