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#include <iostream>
using namespace std;
class Node {
public:
int data;
Node* next;
Node() : data(0), next(NULL) {
cout << "Constructed default node\n";
}
Node(int data) : data(data), next(NULL) {
cout << "Constructed node: " << data << "\n";
}
~Node() {
cout << "Destructed node: " << data << "\n";
}
};
class LinkedList{
public:
LinkedList() { // constructor
head = NULL;
}
~LinkedList() {
clear();
}
void insert(int val);
void display();
void clear();
private:
Node* head;
};
// function to add node to a list
void LinkedList::insert(int val) {
Node* newnode = new Node(val);
if (head == NULL) {
head = newnode;
}
else {
Node* temp = head; // head is not NULL
while (temp->next != NULL) {
temp = temp->next; // go to end of list
}
temp->next = newnode; // linking to newnode
}
}
// function to delete the entire list
void LinkedList::clear() {
Node* next;
Node* temp = head;
while (temp != NULL) {
next = temp->next;
delete temp;
temp = next;
}
head = NULL;
}
// function to display the entire list
void LinkedList::display() {
if (head == NULL) {
cout << "List is empty!" << endl;
}
else {
Node* temp = head;
while (temp != NULL) {
cout << temp->data << " ";
temp = temp->next;
}
cout << endl;
}
}
int main() {
LinkedList list;
cout << "Creating List\n";
list.insert(999);
list.insert(200);
list.insert(300);
list.insert(700);
list.insert(500);
cout << "Linked List data:\n";
list.display();
cout << "Clearing list\n";
list.clear();
cout << "Creating List\n";
list.insert(400);
list.insert(600);
cout << "Linked List data:\n";
list.display();
cout << "NOT clearing list (should happen automatically\n";
return 0;
}
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