Node Struct

So far we have the following
 class  Node  {
 public:
     int  number;
     Node  *next;
     Node(int  val = 0,  Node  *next = NULL)
              :  number(val),  next(next)  {  }
     static  Node*  deep_copy(Node  *n);
     static  void  delete_chain(Node  *n);
 };