Use C++ for the folliowing:

In linkedList.h, read and become familiar with familiar with the class linkedListType.

In linkedList.h, add definitions for the following functions:

getKThElement *If the kth element does exist, return the info stored at that location. *If the kth element does not exist, end the program. * Hint: consider creating a pointer to point to nodes of the linked list. * Here is the syntax for creating a pointer for the templated struct nodeType: nodeType *myNodeTypePointer;

deteteKthElement *If the kth element does exist, delete the kth element. *If the kth element does not exist, end the program. * Keep in mind differences for deleteing a node form a link list when for when that node is at the beginning of the list, end of a list, somewhere between the beginning and end, or a combination of these. Do not modify anything else in the program.

Additional requirements and instructions:

No use of global variables. Code is well commented. Comments for functions describe what they do. They also describe the post conditions. If parameter names are not descriptive in function headers, the comments for a function describe the pre conditions as well.

-----------linkedList.h--------------------

#ifndef H_LinkedListType #define H_LinkedListType

#include #include using namespace std;

//Definition of the node

template struct nodeType { Type info; nodeType *link; };

template class linkedListIterator { public: linkedListIterator(); //Default constructor //Postcondition: current = nullptr;

linkedListIterator(nodeType *ptr); //Constructor with a parameter. //Postcondition: current = ptr;

Type operator*(); //Function to overload the dereferencing operator *. //Postcondition: Returns the info contained in the node.

linkedListIterator operator++(); //Overload the pre-increment operator. //Postcondition: The iterator is advanced to the next // node.

bool operator==(const linkedListIterator& right) const; //Overload the equality operator. //Postcondition: Returns true if this iterator is equal to // the iterator specified by right, // otherwise it returns the value false.

bool operator!=(const linkedListIterator& right) const; //Overload the not equal to operator. //Postcondition: Returns true if this iterator is not // equal to the iterator specified by // right; otherwise it returns the value // false.

private: nodeType *current; //pointer to point to the current //node in the linked list };

template linkedListIterator::linkedListIterator() { current = nullptr; }

template linkedListIterator:: linkedListIterator(nodeType *ptr) { current = ptr; }

template Type linkedListIterator::operator*() { return current->info; }

template linkedListIterator linkedListIterator::operator++() { current = current->link;

return *this; }

template bool linkedListIterator::operator== (const linkedListIterator& right) const { return (current == right.current); }

template bool linkedListIterator::operator!= (const linkedListIterator& right) const { return (current != right.current); }

//***************** class linkedListType ****************

template class linkedListType { public: const linkedListType& operator= (const linkedListType&); //Overload the assignment operator.

void initializeList(); //Initialize the list to an empty state. //Postcondition: first = nullptr, last = nullptr, count = 0;

bool isEmptyList() const; //Function to determine whether the list is empty. //Postcondition: Returns true if the list is empty, // otherwise it returns false.

void print() const; //Function to output the data contained in each node. //Postcondition: none

int length() const; //Function to return the number of nodes in the list. //Postcondition: The value of count is returned.

void destroyList(); //Function to delete all the nodes from the list. //Postcondition: first = nullptr, last = nullptr, count = 0;

Type front() const; //Function to return the first element of the list. //Precondition: The list must exist and must not be // empty. //Postcondition: If the list is empty, the program // terminates; otherwise, the first // element of the list is returned.

Type back() const; //Function to return the last element of the list. //Precondition: The list must exist and must not be // empty. //Postcondition: If the list is empty, the program // terminates; otherwise, the last // element of the list is returned.

virtual bool search(const Type& searchItem) const = 0; //Function to determine whether searchItem is in the list. //Postcondition: Returns true if searchItem is in the // list, otherwise the value false is // returned.

virtual void insertFirst(const Type& newItem) = 0; //Function to insert newItem at the beginning of the list. //Postcondition: first points to the new list, newItem is // inserted at the beginning of the list, // last points to the last node in the list, // and count is incremented by 1.

virtual void insertLast(const Type& newItem) = 0; //Function to insert newItem at the end of the list. //Postcondition: first points to the new list, newItem // is inserted at the end of the list, // last points to the last node in the list, // and count is incremented by 1.

virtual void deleteNode(const Type& deleteItem) = 0; //Function to delete deleteItem from the list. //Postcondition: If found, the node containing // deleteItem is deleted from the list. // first points to the first node, last // points to the last node of the updated // list, and count is decremented by 1.

linkedListIterator begin(); //Function to return an iterator at the begining of the //linked list. //Postcondition: Returns an iterator such that current is // set to first.

linkedListIterator end(); //Function to return an iterator one element past the //last element of the linked list. //Postcondition: Returns an iterator such that current is // set to nullptr.

linkedListType(); //default constructor //Initializes the list to an empty state. //Postcondition: first = nullptr, last = nullptr, count = 0;

linkedListType(const linkedListType& otherList); //copy constructor

~linkedListType(); //destructor //Deletes all the nodes from the list. //Postcondition: The list object is destroyed.

Type getKThElement(int k); void deteteKthElement(int k);

protected: int count; //variable to store the number of //elements in the list nodeType *first; //pointer to the first node of the list nodeType *last; //pointer to the last node of the list

private: void copyList(const linkedListType& otherList); //Function to make a copy of otherList. //Postcondition: A copy of otherList is created and // assigned to this list. };

template bool linkedListType::isEmptyList() const { return(first == nullptr); }

template linkedListType::linkedListType() //default constructor { first = nullptr; last = nullptr; count = 0; }

template void linkedListType::destroyList() { nodeType *temp; //pointer to deallocate the memory //occupied by the node while (first != nullptr) //while there are nodes in the list { temp = first; //set temp to the current node first = first->link; //advance first to the next node delete temp; //deallocate the memory occupied by temp } last = nullptr; //initialize last to nullptr; first has already //been set to nullptr by the while loop count = 0; }

template void linkedListType::initializeList() { destroyList(); //if the list has any nodes, delete them }

template void linkedListType::print() const { nodeType *current; //pointer to traverse the list

current = first; //set current so that it points to //the first node while (current != nullptr) //while more data to print { cout << current->info << " "; current = current->link; } }//end print

template int linkedListType::length() const { return count; } //end length

template Type linkedListType::front() const { assert(first != nullptr);

return first->info; //return the info of the first node }//end front

template Type linkedListType::back() const { assert(last != nullptr);

return last->info; //return the info of the last node }//end back

template linkedListIterator linkedListType::begin() { linkedListIterator temp(first);

return temp; }

template linkedListIterator linkedListType::end() { linkedListIterator temp(nullptr);

return temp; }

template void linkedListType::copyList (const linkedListType& otherList) { nodeType *newNode; //pointer to create a node nodeType *current; //pointer to traverse the list

if (first != nullptr) //if the list is nonempty, make it empty destroyList();

if (otherList.first == nullptr) //otherList is empty { first = nullptr; last = nullptr; count = 0; } else { current = otherList.first; //current points to the //list to be copied count = otherList.count;

//copy the first node first = new nodeType; //create the node

first->info = current->info; //copy the info first->link = nullptr; //set the link field of //the node to nullptr last = first; //make last point to the //first node current = current->link; //make current point to //the next node

//copy the remaining list while (current != nullptr) { newNode = new nodeType; //create a node newNode->info = current->info; //copy the info newNode->link = nullptr; //set the link of //newNode to nullptr last->link = newNode; //attach newNode after last last = newNode; //make last point to //the actual last node current = current->link; //make current point //to the next node }//end while }//end else }//end copyList

template linkedListType::~linkedListType() //destructor { destroyList(); }//end destructor

template linkedListType::linkedListType (const linkedListType& otherList) { first = nullptr; copyList(otherList); }//end copy constructor

//overload the assignment operator template const linkedListType& linkedListType::operator= (const linkedListType& otherList) { if (this != &otherList) //avoid self-copy { copyList(otherList); }//end else

return *this; }

template Type linkedListType::getKThElement(int k) { // ADD CODE HERE FOR LAB 21 }

template void linkedListType::deteteKthElement(int k) { // ADD CODE HERE FOR LAB 21 }

#endif

--------------unorderedLinkedList.h-------------------

#ifndef H_UnorderedLinkedList #define H_UnorderedLinkedList

#include "linkedList.h"

using namespace std; template class unorderedLinkedList: public linkedListType { public: bool search(const Type& searchItem) const; //Function to determine whether searchItem is in the list. //Postcondition: Returns true if searchItem is in the // list, otherwise the value false is // returned.

void insertFirst(const Type& newItem); //Function to insert newItem at the beginning of the list. //Postcondition: first points to the new list, newItem is // inserted at the beginning of the list, // last points to the last node in the // list, and count is incremented by 1.

void insertLast(const Type& newItem); //Function to insert newItem at the end of the list. //Postcondition: first points to the new list, newItem // is inserted at the end of the list, // last points to the last node in the // list, and count is incremented by 1.

void deleteNode(const Type& deleteItem); //Function to delete deleteItem from the list. //Postcondition: If found, the node containing // deleteItem is deleted from the list. // first points to the first node, last // points to the last node of the updated // list, and count is decremented by 1. };

template bool unorderedLinkedList:: search(const Type& searchItem) const { nodeType *current; //pointer to traverse the list bool found = false; current = first; //set current to point to the first //node in the list

while (current != nullptr && !found) //search the list if (current->info == searchItem) //searchItem is found found = true; else current = current->link; //make current point to //the next node return found; }//end search

template void unorderedLinkedList::insertFirst(const Type& newItem) { nodeType *newNode; //pointer to create the new node

newNode = new nodeType; //create the new node

newNode->info = newItem; //store the new item in the node newNode->link = first; //insert newNode before first first = newNode; //make first point to the //actual first node count++; //increment count

if (last == nullptr) //if the list was empty, newNode is also //the last node in the list last = newNode; }//end insertFirst

template void unorderedLinkedList::insertLast(const Type& newItem) { nodeType *newNode; //pointer to create the new node

newNode = new nodeType; //create the new node

newNode->info = newItem; //store the new item in the node newNode->link = nullptr; //set the link field of newNode //to nullptr

if (first == nullptr) //if the list is empty, newNode is //both the first and last node { first = newNode; last = newNode; count++; //increment count } else //the list is not empty, insert newNode after last { last->link = newNode; //insert newNode after last last = newNode; //make last point to the actual //last node in the list count++; //increment count } }//end insertLast

template void unorderedLinkedList::deleteNode(const Type& deleteItem) { nodeType *current; //pointer to traverse the list nodeType *trailCurrent; //pointer just before current bool found;

if (first == nullptr) //Case 1; the list is empty. cout << "Cannot delete from an empty list." << endl; else { if (first->info == deleteItem) //Case 2 { current = first; first = first->link; count--; if (first == nullptr) //the list has only one node last = nullptr; delete current; } else //search the list for the node with the given info { found = false; trailCurrent = first; //set trailCurrent to point //to the first node current = first->link; //set current to point to //the second node

while (current != nullptr && !found) { if (current->info != deleteItem) { trailCurrent = current; current = current-> link; } else found = true; }//end while

if (found) //Case 3; if found, delete the node { trailCurrent->link = current->link; count--;

if (last == current) //node to be deleted //was the last node last = trailCurrent; //update the value //of last delete current; //delete the node from the list } else cout << "The item to be deleted is not in " << "the list." << endl; }//end else }//end else }//end deleteNode

#endif

--------mainProgram.cpp-------------

//Programming Exercise 3: Test Program //22 34 56 2 89 90 0 14 56 11 43 55 -999

#include #include "unorderedLinkedList.h"

using namespace std;

int main() { unorderedLinkedList list; int num;

cout << "Enter numbers ending with -999" << endl; cin >> num;

while (num != -999) { list.insertLast(num); cin >> num; }

cout << endl;

cout << "List: "; list.print(); cout << endl; cout << "Length of the list: " << list.length() << endl;

int k;

cout << "Enter the position of the item to be retrieved: " << endl; cin >> k; cout << endl;

int temp = list.getKThElement(k);

cout << "Item at position " << k << " = " << temp << endl;

cout << "Enter the position of the item to be removed: " << endl; cin >> k; cout << endl;

list.deteteKthElement(k);

cout << "List after removing the element at position " << k << "." << endl; list.print(); cout << endl;

return 0; }