Untitled

#include <stdio.h>
#include <stdlib.h>
struct node
{
    int data1;
    struct node *next;
    struct node *prev;
};
struct node *head = NULL;
void createlist()
{
    struct node *n1, *n2, *n3, *n4, *n5, *n6, *n7;
    n1 = (struct node *)malloc(sizeof(struct node));
    n2 = (struct node *)malloc(sizeof(struct node));
    n3 = (struct node *)malloc(sizeof(struct node));
    n4 = (struct node *)malloc(sizeof(struct node));
    n5 = (struct node *)malloc(sizeof(struct node));
    n6 = (struct node *)malloc(sizeof(struct node));
    n7 = (struct node *)malloc(sizeof(struct node));

    n1->data1 = 10;
    n2->data1 = 20;
    n3->data1 = 30;
    n4->data1 = 40;
    n5->data1 = 50;
    n6->data1 = 60;
    n7->data1 = 70;

    n1->next = n2;
    n2->next = n3;
    n3->next = n4;
    n4->next = n5;
    n5->next = n6;
    n6->next = n7;
    n7->next = n1;

    n1->prev = n7;
    n2->prev = n1;
    n3->prev = n2;
    n4->prev = n3;
    n5->prev = n4;
    n6->prev = n5;
    n7->prev = n6;

    head = n1;
}
void display()
{
    if (head == NULL)
    {
        printf("List is empty.\n");
        return;
    }

    struct node *temp = head;
    do
    {
        printf("%d ", temp->data1);
        temp = temp->next;
    } while (temp != head);
    printf("\n");
}
void insert_at_head(int value)
{
    struct node *newNode = (struct node *)malloc(sizeof(struct node));
    newNode->data1 = value;

    if (head == NULL)
    {
        newNode->next = newNode;
        newNode->prev = newNode;
        head = newNode;
        return;
    }

    struct node *last = head->prev;
    newNode->next = head;
    newNode->prev = last;
    head->prev = newNode;
    last->next = newNode;
    head = newNode;
}
void insert_at_tail(int value)
{
    struct node *newNode = (struct node *)malloc(sizeof(struct node));
    newNode->data1 = value;

    if (head == NULL)
    {
        newNode->next = newNode;
        newNode->prev = newNode;
        head = newNode;
        return;
    }

    struct node *last = head->prev;
    newNode->next = head;
    newNode->prev = last;
    last->next = newNode;
    head->prev = newNode;
}
void insert_at_position(int value, int position)
{
    struct node *newNode = (struct node *)malloc(sizeof(struct node));
    newNode->data1 = value;

    if (position == 1)
    {
        insert_at_head(value);
        return;
    }

    struct node *temp = head;
    int count = 1;

    while (count < position - 1 && temp->next != head)
    {
        temp = temp->next;
        count++;
    }

    newNode->next = temp->next;
    newNode->prev = temp;
    temp->next->prev = newNode;
    temp->next = newNode;
}
void delete_at_head()
{
    if (head == NULL)
        return;

    struct node *temp = head;

    if (head->next == head)
    {
        head = NULL;
        free(temp);
        return;
    }

    struct node *last = head->prev;
    head = head->next;
    head->prev = last;
    last->next = head;

    free(temp);
}
void delete_at_tail()
{
    if (head == NULL)
        return;

    struct node *last = head->prev;

    if (head->next == head)
    {
        head = NULL;
        free(last);
        return;
    }

    struct node *second_last = last->prev;
    second_last->next = head;
    head->prev = second_last;

    free(last);
}
void delete_at_position(int position)
{
    if (head == NULL)
        return;

    struct node *temp = head;

    if (position == 1)
    {
        delete_at_head();
        return;
    }

    int count = 1;
    while (count < position && temp->next != head)
    {
        temp = temp->next;
        count++;
    }

    struct node *prevNode = temp->prev;
    struct node *nextNode = temp->next;

    prevNode->next = nextNode;
    nextNode->prev = prevNode;

    free(temp);
}
int main()
{
    createlist();
    printf("Your Circular Doubly Linked List:\n");
    display();

    insert_at_head(5);
    printf("After inserting 5 at head:\n");
    display();

    insert_at_tail(100);
    printf("After inserting 100 at tail:\n");
    display();

    insert_at_position(25, 4);
    printf("After inserting 25 at position 4:\n");
    display();

    delete_at_head();
    printf("After deleting at head:\n");
    display();

    delete_at_tail();
    printf("After deleting at tail:\n");
    display();

    delete_at_position(3);
    printf("After deleting at position 3:\n");
    display();

    return 0;
}