private:

string word;

WordNode * next;

public:

explicit WordNode(const string & s) : word{s} {

next = nullptr;

}

friend class WordList;

friend ostream& operator<<(ostream& strm, const class WordList& m);

private:

int size;

WordNode * first;

WordNode * last;

public:

WordList() : size(0), first(nullptr), last(nullptr) {}

~WordList() {

WordNode *curr = first;

WordNode * ptr;

while (curr) {

ptr = curr;

curr = curr->next;

delete(ptr);

ptr = nullptr;

}

curr = nullptr;

first = nullptr;

last = nullptr;

}

void addToFront(string s);

void addToRear(string s);

bool isEmpty() const { return ( size == 0 ); }

friend ostream& operator<<(ostream& strm, const WordList& m);

WordNode * newWordNode = new WordNode(s);

newWordNode->next = first;

first = newWordNode;

size++;

if (size == 1) {

last = first;

}

WordNode * newWordNode = new WordNode(s);

if (isEmpty()) {

addToFront(s);

}

else {

last->next = newWordNode;

last = newWordNode;

size++;

}

WordList words;

words.addToFront("Hello");

words.addToRear("World");

words.addToRear("goodbye");

words.addToFront("CSC220");

cout << words << endl;

return 0;