Array Insertion at Beginning in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to shift elements right before inserting at the beginning.

DSA C

for(int i = n - 1; i >= [1]; i--) {
    arr[i + 1] = arr[i];
}

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

A1

B0

Cn

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Starting the loop from 1 instead of 0 causes missing the first element.

Using n instead of 0 causes out-of-bound errors.

We shift elements starting from the last index down to 0 to make space at the beginning.

2fill in blank

medium

Complete the code to insert the new element at the beginning of the array.

DSA C

arr[[1]] = new_element;

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

An

B1

C0

Dn-1

Attempts:

3 left

💡 Hint

Common Mistakes

Inserting at index n or n-1 overwrites the last element.

Inserting at index 1 misses the true beginning.

The new element is inserted at index 0, the beginning of the array.

3fill in blank

hard

Fix the error in the loop condition to correctly shift elements for insertion.

DSA C

for(int i = n - 1; i [1] 0; i--) {
    arr[i + 1] = arr[i];
}

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

A>

B<

C<=

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' causes the loop to never run.

Using '<=' causes incorrect shifting direction.

The loop must run while i is greater than or equal to 0 to shift all elements.

4fill in blank

hard

Fill both blanks to correctly shift elements and insert at the beginning.

DSA C

for(int i = n - 1; i [1] [2]; i--) {
    arr[i + 1] = arr[i];
}

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

A>=

B>

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' and 1 misses shifting the first element.

Using '<' or '<=' causes wrong loop direction.

The loop runs while i is greater than or equal to 0 to shift all elements starting from the last index.

5fill in blank

hard

Fill all three blanks to complete the insertion function at the beginning of the array.

DSA C

void insertAtBeginning(int arr[], int n, int new_element) {
    for(int i = n - 1; i [1] [2]; i--) {
        arr[i + 1] = arr[i];
    }
    arr[[3]] = new_element;
}

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

A>=

B0

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' without '=' misses shifting the first element.

Inserting at index other than 0 overwrites wrong element.

The loop shifts elements while i >= 0, and the new element is inserted at index 0.