code

#include <iostream>
using namespace std;

struct Node
{
 int entry;
 Node *next;
 Node();
 Node(int item,Node *add_on);
};

Node::Node()
{
 next=NULL;
...

double_node.h

#ifndef D_NODE_H

#define D_NODE_H

 #include <iostream>

using namespace std; 

template <class Node_entry>struct Node {//  data members  
...

list.h

#ifndef LIST_H

#define LIST_H 

const int Listsize=6;

enum Error_code {success, overflow, range_errors}; 

template <class List_entry>

class List {

public...

linked_queue.cpp 

#include <iostream>
using namespace std;

enum Error_code{success,overflow,underflow};

typedef int Node_entry;
typedef int Queue_entry;

struct Node{
 Node_entry...

 linked_stack.cpp

#include <iostream>
using namespace std;
typedef int Node_entry;
typedef int Stack_entry;
enum Error_code{overflow,success,underflow};

struct Node{
 Node_entry entry;...