Design a doubly linked list, Data Structure & Algorithms

Instructions :

  • You have to design a doubly linked list container.
  • The necessary classes and their declarations are given below
  • The main() function for testing the your design is also given below. The outputs form each of the output statements are provided in the text box for your comparison.
  • So complete the program by supplying your implementations of the member functions. Some are already implemented, use as it is.

// List . h

template

class List;

template

std::ostream& operator<< (std::ostream& os, const List& l);

template

class Link;

template

class ListIterator;

template

class List{

            friend std::ostream& operator<< (std::ostream& os, const List& l);

public:

typedef ListIterator Iterator;

List() : first_(0), last_(0) {};

List(const List & other);                    // copy constructor

~List();                                                  // destructor

List & operator = (const List & rhs);  // assignment operator

T& front() const;                                                // returns the front element

void push_front(const T& e);                  // adds from front

void pop_front();                                               // deletes from front

T& back() const;                                                // returns the last element

void push_back(const T& e);                 // adds from back

void pop_back();                                               // deletes the last element

void clear();                                                       // emptied by deleting all elements in it

bool empty() const;                                           // return true if list id empty

int size() const;                                      // returns the no. of elements

Iterator begin();

Iterator end();

Iterator insert(Iterator& itr, const T& val);

void insert(Iterator& itr, int n, const T& val);

void erase(Iterator& itr);

void erase(Iterator& start, Iterator& stop);

private:

void copy(const List & other);                      // private utility only, users use =

Node* first;                                     // points to first node

Node* last;                                      // points to last node

};

template

std::ostream& operator<< (std::ostream& os, const List& lst){

            os<<"f[ ";

            Link *pp = lst.first_; //cursor to lst

            while(pp != 0){

                        if(pp != lst.first_)os<<", ";

                                    os<< pp->elem_;

                        pp = pp->next_;

            }

            os<<" ]b"<

            return os;

}

 

template                                 //  implements the node of a doubly linked list

class Node{

                        friend class List;

                        friend class ListIterator;

                        friend std::ostream& operator<< (std::ostream& os, const List& l);

            private:

                        Node(const T& e) : elem_(e), next_(0), prev_(0){} // constrructor

                        T elem_;                        // element value

                        Node* next; //  pointer to next element in the list

                        Node* prev; //  pointer to the previous element in the list

};

template                                 // implements a iterator for the list class

class ListIterator{

                        friend class List;

                        typedef ListIterator Iterator;

            public:

                        ListIterator(List* list = 0, Link* ccNode = 0) : list_(list), cNode(ccNode) {}

                        T& operator *(){

                                    //  returns the element value of the node pointed by the iterator

                        }

                        bool operator == (Iterator rhs){

                                    // returns true  if this integrator and itertrator rhs are pointing to same node                                  }

                        bool operator != (Iterator rhs){

                                    // returns false if this integrator and itertrator rhs are pointing to same node        

                        }

                        Iterator& operator ++ (int){

                                    // advance the iterator to the right

                        }

                        Iterator operator ++ (){

                                    // postfix version

                        }

                        Iterator& operator -- (int){

                                    // backward the iterator by one position to the left

                        }

                        Iterator operator -- (){

                                    // postfix  version

                        };

            private:

                        List* list;                  // pointer to current doubly linked list object

                        Node* cNode;         // pointer to the node in the doubly linked list

};

// Main driver program

#include "List.h"

#include

#include

using namespace std;

 

typedef List ListD;

typedef List ListI;

typedef List ListS;

int main(){

            ListD    x;

            x.push_front(4.4); x.push_front(3.3); x.push_front(2.2); x.push_front(1.1);

 

            ListD y(x);

            ListD z = x;

            // output is shown in the text box 1

            cout<< "x.front = "<< x.front()<< endl;   

            cout<< "List x ="<

            cout<< "x.size() ="<< x.size()<< endl;

            while(!x.empty()){

                        cout<< x.front()<< endl;

                        x.pop_front();

            }

           cout<< "x.size() now = "<< x.size()<< endl;

            cout<< "List y ="<

            cout<< y<< endl;

            cout<< "List z ="<

            cout<< z<< endl;

            ListD v;

            v = y;

            v.pop_front();

                        // output is show in the text box  2

             cout<< "List v (v = y; v.pop_front();) ="<

            cout<< v<< endl;

            ListI li;

            li.push_front(3); li.push_front(2); li.push_front(1);

                        // output is show in the text box 3

            cout<< "List li via operator <<"<

            cout<< li<< endl;

            li.push_back(22);

            li.push_back(33);

                        // output is show in the text box 4

            cout<< "li.push_back(22), li.push_back(33)"<< endl;

            cout<< li<< endl;

            cout<< "back(), pop.back()"<< endl;

            while(!li.empty()){

                        cout<< li.back()<< endl;

                        li.pop_back();

            }

           ListS ls;

            ls.push_front("abcd");

            ls.push_front("cdefgh");

            ls.push_back("back");

            cout<< ls<< endl;          // output is show in the text box 5

            ListI c5;

            for(uint i = 0; i< 5; ++i){

                        c5.push_back(i);

                        cout<< "c5.push_back(i = "<< i<< "): "<< c5;  // output is show in the text box6

            }

           cout<< "using Iterator"<< endl;   // output is show in the text box 7                   

            ListI::Iterator itr = c5.begin();

            ListI::Iterator itrb = c5.begin();

            ListI::Iterator itre = c5.end();

            if(itr == itrb)       cout<< "itr == itrb"<< endl;

            else cout<< "itr != itrb"<< endl;

            if(itr != itrb)        cout<< "itr != itrb"<< endl;

            else cout<< "itr == itrb"<< endl;

            ListI::Iterator it;

            for(it = c5.begin(); it != c5.end(); ++it){

                        cout<< *it<< ' ';             // output is show in the text box 7

            }

            // output is show in the text box 8

            cout<< "ListI::Iterator itr2 = c5.begin(), ++, ++ "<< endl;

            cout<< "c5.insert(itr2, 5, 33) "<< endl;

            ListI::Iterator itr2 = c5.begin();

            itr2++; itr2++;

            c5.insert(itr2, 5, 33);

            cout<< c5;

            return 0;

}

Posted Date: 2/26/2013 3:14:46 AM | Location : United States







Related Discussions:- Design a doubly linked list, Assignment Help, Ask Question on Design a doubly linked list, Get Answer, Expert's Help, Design a doubly linked list Discussions

Write discussion on Design a doubly linked list
Your posts are moderated
Related Questions
Question 1 Write the different characteristics of an algorithm Question 2 Explain in brief the asymptotic notations Question 3 Write an algorithm of insertion sort and e

Comparison Techniques There are several techniques for determining the relevancy and relative position of two polygons. Not all tests may be used with all hidden-surface algori

Construct a B+ tree for the following keys, starting with an empty tree.  Each node in the tree can hold a maximum of 2 entries (i.e., order d = 1). Start with an empty root nod

Explain about the Abstract data type Abstract data type (ADT) A set of values (the carrier set) and operations on those values

Which are the two standard ways of traversing a graph? i. The depth-first traversal   ii. The breadth-first traversal

what is circular doubly link list?write down the algorithm for insertion of elements in circular doubly link list

Explain the Assertions in Ruby Ruby offers no support for assertions whatever. Moreover, because it's weakly typed, Ruby doesn't even enforce rudimentary type checking on opera

two standards ways of traversing a graph in data structure

How to create multiple queue on single array?

Q. The reason bubble sort algorithm is inefficient is that it continues execution even after an array is sorted by performing unnecessary comparisons. Therefore, the number of comp