Linked List vs Array When to Choose Which in DSA C - Interactive Comparison Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an array of 5 integers.

DSA C

int numbers[[1]];

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A0

B10

C5

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero as size which creates an empty array.

Forgetting to specify the size.

The array size must be specified as 5 to hold 5 integers.

2fill in blank

medium

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

DSA C

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

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ANode

Bstruct

Cint

Dmalloc

Attempts:

3 left

💡 Hint

Common Mistakes

Using sizeof(int) which is too small.

Using sizeof(struct) which is invalid.

We allocate memory for a Node structure, so sizeof(Node) is needed.

3fill in blank

hard

Fix the error in the code to correctly insert a node at the beginning of a linked list.

DSA C

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

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Anext

BnewNode

CNULL

Dhead

Attempts:

3 left

💡 Hint

Common Mistakes

Setting next to newNode causes a cycle.

Setting next to NULL loses the rest of the list.

The new node's next should point to the current head before updating head.

4fill in blank

hard

Fill both blanks to complete the code that prints all elements of an integer array.

DSA C

for(int i = 0; i [1] n; i[2]) {
    printf("%d ", arr[i]);
}

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A<

B<=

C++

D--

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= causes out-of-bounds access.

Using -- causes infinite loop.

The loop runs while i is less than n and increments i each time.

5fill in blank

hard

Fill all three blanks to complete the code that creates a linked list node and sets its data and next pointer.

DSA C

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

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

ANode

Bvalue

CNULL

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using sizeof(int) instead of Node.

Forgetting to set next to NULL.

Allocate memory for Node, assign data from value, and set next to NULL for end of list.