SYBCom(CA) DS Practical Slip 7 Q.A

Write a ‘C’ program to create doubly link list and display nodes having odd value.

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

// Structure of a doubly linked list node
struct Node {
    int data;
    struct Node* prev;
    struct Node* next;
};

// Function to create a 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 nodes with odd values
void displayOddNodes(struct Node* head) {
    if (head == NULL) {
        printf("List is empty.\n");
        return;
    }

    struct Node* temp = head;
    printf("Nodes with odd values:\n");

    while (temp != NULL) {
        if (temp->data % 2 != 0) {
            printf("%d ", temp->data);
        }
        temp = temp->next;
    }
    printf("\n");
}

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

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

    head = createList(n);

    displayOddNodes(head);

    return 0;
}