One-dimensional arrays in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an array of 5 integers.

C++

int arr[[1]];

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

A5

B10

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 as size which creates an empty array.

Forgetting to specify the size.

The array size must be specified as 5 to create an array with 5 elements.

2fill in blank

medium

Complete the code to assign the value 10 to the first element of the array.

C++

arr[[1]] = 10;

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

A5

B0

C1

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 as the first index.

Using negative indices which are invalid.

Array indexing in C++ starts at 0, so the first element is at index 0.

3fill in blank

hard

Fix the error in the code to correctly print the third element of the array.

C++

std::cout << arr[[1]] << std::endl;

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

A3

B0

C1

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 3 which is the fourth element.

Using index 1 which is the second element.

The third element is at index 2 because indexing starts at 0.

4fill in blank

hard

Fill both blanks to create an array of 4 integers and assign 7 to its last element.

C++

int arr[[1]];
arr[[2]] = 7;

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

A4

B3

C5

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 4 which is out of bounds.

Using size 5 instead of 4.

The array size is 4, so the last element is at index 3 (4 - 1).

5fill in blank

hard

Fill all three blanks to initialize an array with values 1, 2, 3 and print the second element.

C++

int arr[[1]] = {1, 2, 3};
std::cout << arr[[2]] << std::endl;
int size = [3];

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

A3

B1

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong size for the array.

Using wrong index to print the second element.

The array size is 3, the second element is at index 1, and size is 3.