Node Structure and Pointer Design in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a pointer to the next node in a linked list node structure.

DSA C

struct Node {
    int data;
    struct Node* [1];
};

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

Apointer

Bprev

Clink

Dnext

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'prev' which is for doubly linked lists.

Using generic names like 'pointer' which are unclear.

The pointer to the next node in a linked list is conventionally named 'next'.

2fill in blank

medium

Complete the code to create a new node and assign its data field.

DSA C

struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
newNode->[1] = 10;

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

Adata

Bnext

Cvalue

Dinfo

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to assign to 'value' or 'info' which are not declared fields.

Assigning to 'next' which is a pointer, not data.

The data field in the node structure is named 'data', so we assign the value to newNode->data.

3fill in blank

hard

Fix the error in the code to correctly link two nodes in a singly linked list.

DSA C

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

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

Aprev

Bnext

Clink

Dpointer

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'prev' which is for doubly linked lists.

Using undefined pointer names like 'link' or 'pointer'.

To link the first node to the second, assign the 'next' pointer of the first node to point to the second node.

4fill in blank

hard

Fill both blanks to declare a doubly linked list node structure with pointers to previous and next nodes.

DSA C

struct Node {
    int data;
    struct Node* [1];
    struct Node* [2];
};

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

Aprev

Bnext

Clink

Dpointer

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'link' or 'pointer' which are not standard names.

Mixing up the order of 'prev' and 'next'.

In a doubly linked list, nodes have 'prev' pointer to the previous node and 'next' pointer to the next node.

5fill in blank

hard

Fill all three blanks to create a function that initializes a new node with given data and sets its pointers to NULL.

DSA C

struct Node* createNode(int value) {
    struct Node* newNode = (struct Node*)malloc(sizeof(struct Node));
    newNode->[1] = value;
    newNode->[2] = [3];
    return newNode;
}

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

Adata

Bnext

CNULL

Dprev

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning value to 'next' or 'prev' instead of 'data'.

Not initializing pointers to NULL.

The function sets the 'data' field to the given value, the 'next' pointer to NULL, and returns the new node.