Insert at Beginning Head Insert in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new node and insert it at the beginning of the linked list.

DSA C

struct Node* new_node = (struct Node*)malloc(sizeof(struct Node));
new_node->data = data;
new_node->next = [1];
head = new_node;

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

Ahead

Bhead->next

CNULL

Dnew_node

Attempts:

3 left

💡 Hint

Common Mistakes

Setting new_node->next to NULL loses the rest of the list.

Setting new_node->next to new_node creates a cycle.

To insert at the beginning, the new node's next should point to the current head.

2fill in blank

medium

Complete the code to update the head pointer after inserting the new node at the beginning.

DSA C

new_node->next = head;
[1] = new_node;

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

Ahead

Bnew_node

Ctemp

Dnext

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning head to temp or next causes errors.

Not updating head leaves the list unchanged.

After insertion, head should point to the new node.

3fill in blank

hard

Fix the error in the code that inserts a new node at the beginning of the list.

DSA C

struct Node* new_node = malloc(sizeof(struct Node));
new_node->data = data;
new_node->next = [1];
head = new_node;

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

Anew_node->next

Bhead->next

CNULL

Dhead

Attempts:

3 left

💡 Hint

Common Mistakes

Using head->next loses the first node.

Setting next to NULL breaks the chain.

The new node's next must point to the current head, not head->next or NULL.

4fill in blank

hard

Fill both blanks to correctly insert a new node at the beginning and update the head pointer.

DSA C

struct Node* new_node = malloc(sizeof(struct Node));
new_node->data = data;
new_node->next = [1];
[2] = new_node;

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

Ahead

Bnew_node

Dtemp

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of assignments.

Using wrong variable names.

The new node's next points to head, and head is updated to new_node.

5fill in blank

hard

Fill all three blanks to create a new node, link it at the beginning, and update the head pointer.

DSA C

struct Node* [1] = malloc(sizeof(struct Node));
[1]->data = data;
[1]->next = [2];
[3] = [1];

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

Anew_node

Bhead

Dtemp

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names.

Not updating head pointer.

Create new_node, set its next to head, then update head to new_node.