NEEDED IN C++

Question 1

Extend the class

linkedListType

by adding the following operations:

1.

Find and delete the node with the smallest

info

in the list. Delete only the

first occurrence and traverse the list only once.

2.

Find and delete all occurrences of a given

info

in the list. Traverse the

list only once.

Add these abstraction functions in the

linkedListType

class and then provide

the definition in the

unorderedlinkedList

class.

Write test code to test your added functions.

HERE IS THE LINKEDLASTTYPE

#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.

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;

}

#endif