{
friend class Linklist;//链表类作为友元类
friend class Stack;//栈类作为友元类
public:
Node();
Node(Node &n);
Node(int i,char c='0');
Node(int i,char c,Node *p,Node *n);
~Node();
private:
int idata;
char cdata;
Node *prior;
Node *next;
};
Node::Node()
{
cout <<"Node constructor is running..." <<endl;
idata=0;
cdata='0';
prior=NULL;
