Array Deletion at Beginning in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to shift all elements left by one to delete the first element.

DSA C

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

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

Ai

Bi - 1

Ci + 1

Dn - i

Attempts:

3 left

💡 Hint

Common Mistakes

Using arr[i - 1] causes out-of-bound access at i=0.

Using arr[i] does not shift elements.

Using arr[n - i] accesses wrong indices.

To delete the first element, each element is replaced by the next element, so arr[i] = arr[i + 1].

2fill in blank

medium

Complete the code to reduce the array size after deletion.

DSA C

n = n [1] 1;

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

A+

B*

C/

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using + increases the size incorrectly.

Using * or / changes size incorrectly.

After deleting the first element, the size of the array decreases by 1, so n = n - 1.

3fill in blank

hard

Fix the error in the loop condition to avoid out-of-bound access.

DSA C

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

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

A<

B<=

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= n causes out-of-bound access.

Using > or >= is incorrect for forward loops.

The loop should run while i < n - 1 to avoid accessing arr[n], which is out of bounds.

4fill in blank

hard

Fill both blanks to complete the function that deletes the first element of the array.

DSA C

void deleteFirst(int arr[], int *n) {
    for(int i = 0; i [1] *n - 1; i++) {
        arr[i] = arr[i [2] 1];
    }
    (*n)--;
}

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

A<

B<=

C+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= causes out-of-bound access.

Using -1 instead of +1 accesses wrong elements.

The loop runs while i < *n - 1, and each element is replaced by the next element arr[i + 1].

5fill in blank

hard

Fill all three blanks to print the array after deleting the first element.

DSA C

for(int i = [1]; i [2] n; i[3]) {
    printf("%d ", arr[i]);
}

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

A0

B<

C++

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Starting from 1 skips the new first element at index 0.

Using i-- or wrong loop condition causes errors.

After deletion, elements are shifted left and n is decremented, so the remaining elements are at indices 0 to n-1. Use i=0; i < n; i++.