Array Insertion at Middle Index in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an integer array of size 5.

DSA C

int arr[[1]];

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A7

B10

C3

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using a size different than 5.

Forgetting to specify the size.

The array size should be 5 to hold 5 elements.

2fill in blank

medium

Complete the code to find the middle index of the array of size 5.

DSA C

int mid = [1] / 2;

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A6

B5

C4

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong size number.

Using floating point division instead of integer.

The middle index is size divided by 2, so 5 / 2 = 2 (integer division).

3fill in blank

hard

Fix the error in the loop that shifts elements to the right before insertion.

DSA C

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

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Amid

B0

Cmid + 1

Dn

Attempts:

3 left

💡 Hint

Common Mistakes

Starting loop at mid + 1 causes skipping the middle element.

Starting loop at 0 shifts all elements unnecessarily.

We start shifting from the middle index to make space for the new element.

4fill in blank

hard

Fill both blanks to insert a new value at the middle index and update the size.

DSA C

arr[[1]] = new_value;
n = [2];

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Amid

Bn + 1

Cn - 1

Dmid + 1

Attempts:

3 left

💡 Hint

Common Mistakes

Inserting at wrong index.

Not updating the size after insertion.

Insert at middle index and increase size by 1 after insertion.

5fill in blank

hard

Fill all three blanks to print the array elements after insertion.

DSA C

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

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

A0

Bn

C++i

D--i

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong start or end index.

Using decrement instead of increment in loop.

Start from 0, go to n (size), and increment i to print all elements.