#include "iostream.h"		template <class Type> class DataList;		template <class Type> class Node {					//數據表中結點類的定義		friend class DataList<Type>;		public:		   Node (  ) : key ( 0 ) { }			//構造函數		   Node ( const Type & value ) : key ( value ) { }			//構造函數		   Type getKey ( ) const { return key; }					//讀取關鍵碼		   void setKey ( Type k ) { key = k; }					//修改關鍵碼		   friend ostream &operator << (ostream &OutStream, const Node<Type> & OutNode );		   friend istream & operator >> ( istream & InStream, Node<Type> & InNode );		private:		   Type key;								//關鍵碼域  //		   other;									//其他域		}; 		template <class Type> class DataList {					//數據表類定義		public:		   DataList ( int sz = 10 ) : ArraySize (sz), Element (new Node<Type>[sz+1]) { }		   virtual ~DataList ( ) { delete [ ] Element; }		   int GetSize() {return CurrentSize;}		   friend ostream &operator << (ostream &OutStream, const DataList<Type> & OutList );		   friend istream & operator >> ( istream & InStream, DataList<Type> & InList );		protected:		   Node<Type> *Element;									//數據表中存儲數據的數組		   int ArraySize, CurrentSize;							//數組最大長度和當前長度		};		template <class Type> ostream & operator << ( ostream & OutStream, const Node<Type> & OutNode ) {		   OutStream << OutNode.key;		   return OutStream;		}		template <class Type> istream & operator >> ( istream & InStream, Node<Type> & InNode ) {		   		   InStream >> InNode.key;		   return InStream;		}		template <class Type> ostream & operator << ( ostream & OutStream, const DataList<Type> & OutList ) {		   OutStream << "Array Contents : \n";					//輸出表的所有表項到OutStream		   for ( int i = 1; i <=OutList.CurrentSize; i++ ) OutStream << OutList.Element[i] << ' ';		   OutStream << endl;								//輸出表的當前長度到OutStream		   OutStream << "Array Current Size : " << OutList.CurrentSize << endl;		   return OutStream;		}		template <class Type> istream & operator >> ( istream & InStream, DataList<Type> & InList ) {		   cout << "Enter array Current Size : ";		   InStream >> InList.CurrentSize;						//從Instream輸入表的當前長度		   cout << "Enter array elements : \n";		   for ( int i=1; i <=InList.CurrentSize; i++ )				//從Instream輸入表的全部表項		   { cout << "Element " << i << " : ";  		     InStream >> InList.Element[i]; 		   }		   return InStream;		}