SYBCom(CA) DS Practical Slip 5 Q.A

Write a C program to implement a doubly linked list with Create and Display
operation.

#include <stdio.h>
#include <stdlib.h>

// Structure of Doubly Linked List Node
struct Node {
    int data;
    struct Node* prev;
    struct Node* next;
};

// Function to create doubly linked list
struct Node* createList(int n) {
    struct Node *head = NULL, *temp = NULL, *newNode = NULL;
    int value;

    for (int i = 0; i < n; i++) {
        printf("Enter value for node %d: ", i + 1);
        scanf("%d", &value);

        newNode = (struct Node*)malloc(sizeof(struct Node));
        newNode->data = value;
        newNode->prev = NULL;
        newNode->next = NULL;

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

    return head;
}

// Function to display doubly linked list (forward direction)
void displayList(struct Node* head) {
    if (head == NULL) {
        printf("List is empty.\n");
        return;
    }

    struct Node* temp = head;

    printf("Doubly Linked List elements (Forward):\n");
    while (temp != NULL) {
        printf("%d <-> ", temp->data);
        temp = temp->next;
    }
    printf("NULL\n");
}

// Main function
int main() {
    struct Node* head = NULL;
    int n;

    printf("Enter number of nodes: ");
    scanf("%d", &n);

    head = createList(n);

    displayList(head);

    return 0;
}