Traversal of Circular Linked List in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start traversal from the head node.

DSA C

struct Node* current = [1];

Drag options to blanks, or click blank then click option'

Ahead

Btail

CNULL

Dcurrent

Attempts:

3 left

💡 Hint

Common Mistakes

Starting traversal from tail instead of head.

Using NULL as starting point in circular list.

Traversal of a circular linked list starts from the head node.

2fill in blank

medium

Complete the condition to stop traversal after one full cycle.

DSA C

do {
    printf("%d -> ", current->data);
    current = current->next;
} while (current != [1]);

Drag options to blanks, or click blank then click option'

ANULL

Bhead

Ctail

Dcurrent

Attempts:

3 left

💡 Hint

Common Mistakes

Using NULL as stopping condition in circular list.

Stopping traversal too early or too late.

Traversal stops when current reaches head again, completing the cycle.

3fill in blank

hard

Fix the error in the traversal loop to avoid infinite loop.

DSA C

struct Node* current = head;
do {
    printf("%d -> ", current->data);
    [1];
} while (current != head);

Drag options to blanks, or click blank then click option'

Acurrent = current->prev

Bcurrent = head

Ccurrent = current->next

Dcurrent = NULL

Attempts:

3 left

💡 Hint

Common Mistakes

Using current->prev causes backward traversal or errors.

Assigning current to head inside loop causes infinite loop.

To move forward in the list, current must be updated to current->next.

4fill in blank

hard

Fill both blanks to create a function that prints all nodes in a circular linked list.

DSA C

void traverseCircularList(struct Node* [1]) {
    struct Node* current = [2];
    if (current == NULL) return;
    do {
        printf("%d -> ", current->data);
        current = current->next;
    } while (current != [1]);
    printf("NULL\n");
}

Drag options to blanks, or click blank then click option'

Ahead

Btail

Ccurrent

Dnode

Attempts:

3 left

💡 Hint

Common Mistakes

Using tail or other pointers instead of head.

Starting traversal from a NULL pointer.

The function parameter and starting pointer should both be 'head' to traverse correctly.

5fill in blank

hard

Fill all three blanks to correctly insert a new node at the end of a circular linked list.

DSA C

void insertEnd(struct Node** [1], int data) {
    struct Node* newNode = malloc(sizeof(struct Node));
    newNode->data = data;
    if (*[2] == NULL) {
        newNode->next = newNode;
        *[3] = newNode;
    } else {
        struct Node* temp = *[3];
        while (temp->next != *[3]) {
            temp = temp->next;
        }
        temp->next = newNode;
        newNode->next = *[3];
    }
}

Drag options to blanks, or click blank then click option'

Ahead

Btail

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing head and tail pointers.

Not updating the list pointer correctly.

The function uses a pointer to head to insert at the end; all blanks should be 'head' for correct insertion.