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Current File : /home/utripoli/public_html/cp/uploads/lessons/add_first_end_dlete_fe.cpp
 #include <iostream>
using namespace std;

// Node structure
struct node {
    int data;
    node *next;
};

// Global head pointer
node *head = nullptr;

// Function Prototypes
void insertValue(int value);
void display();
void insert_beg(int value);
void delete_first_node();
void delete_last_node();

int main() {
    insertValue(12);
    display();

    insertValue(67);
     insert_beg(89);
     //delete_first_node()
     delete_last_node();
    insertValue(600);
    display();

      // Insert at beginning
    display();

     ;
    display();

    delete_first_node(); // Delete first node
    display();

    delete_last_node(); // Delete last node
    display();

    return 0;
}

// Insert at the end
void insertValue(int value) {
    node *new_node = new node;
    new_node->data = value;
    new_node->next = nullptr;

    if (head == nullptr) {
        head = new_node;
    } else {
        node *last = head;
        while (last->next != nullptr) {
            last = last->next;
        }
        last->next = new_node;
    }
}

// Display the linked list
void display() {
    if (head == nullptr) {
        cout << "There is no value to be displayed" << endl;
    } else {
        node *temp = head;
        while (temp != nullptr) {
            cout << temp->data << "\t";
            temp = temp->next;
        }
        cout << endl;
    }
}

// Insert at the beginning
void insert_beg(int value) {
    node *new_node = new node;
    new_node->data = value;
    new_node->next = head;
    head = new_node;
}

// Delete the first node
void delete_first_node() {
    if (head == nullptr) {
        cout << "There is no node to delete.\n";
    } else {
        node *first_node = head;
        head = first_node->next;
        delete first_node;
    }
}

// Delete the last node
void delete_last_node() {
    if (head == nullptr) {
        cout << "There is no node to delete.\n";
    } else if (head->next == nullptr) {
        // Only one node
        delete head;
        head = nullptr;
    } else {
        node *prev = head;
        node *last = head->next;

        while (last->next != nullptr) {
            prev = last;
            last = last->next;
        }

        prev->next = nullptr;
        delete last;
    }
}

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