Delete a Node from Circular Linked List in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new node in a circular linked list.

DSA C

struct Node* newNode = (struct Node*) malloc(sizeof([1]));

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Achar

BNode

Cvoid

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using a basic data type like int or char instead of the node struct.

Forgetting to cast the malloc return value.

We allocate memory for a new node of type 'Node' to create a new node in the circular linked list.

2fill in blank

medium

Complete the code to check if the circular linked list is empty.

DSA C

if (head == [1]) {

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ANULL

Bhead

C0

Dhead->next

Attempts:

3 left

💡 Hint

Common Mistakes

Comparing head to 0 or head->next instead of NULL.

Using assignment '=' instead of comparison '=='.

The list is empty if the head pointer is NULL.

3fill in blank

hard

Fix the error in the code to delete the head node from a circular linked list.

DSA C

while (temp->next != [1]) { temp = temp->next; }

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Ahead

Btemp

CNULL

Dhead->next

Attempts:

3 left

💡 Hint

Common Mistakes

Checking temp->next against head->next instead of head.

Using NULL in a circular list where no node points to NULL.

To find the last node, we check where temp->next points to head, not head->next.

4fill in blank

hard

Fill both blanks to correctly update pointers when deleting the head node.

DSA C

temp->next = [1];
head = [2];

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Ahead->next

Btemp

Chead

DNULL

Attempts:

3 left

💡 Hint

Common Mistakes

Setting temp->next to head instead of head->next.

Not updating head to the new node.

The last node's next pointer should point to the new head, which is head->next, and head should be updated to head->next.

5fill in blank

hard

Fill all three blanks to delete a node with a given key from the circular linked list.

DSA C

struct Node *prev = head;
struct Node *curr = head->next;
while (curr != head && curr->data != [1]) {
    prev = curr;
    curr = curr->[2];
}
if (curr->data == [3]) {
    prev->next = curr->next;
    free(curr);
}

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Akey

Bnext

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names for key or next pointer.

Not checking the condition properly in the while loop.

We compare curr->data with key, move curr to curr->next, and check again if curr->data equals key to delete the node.