Array size and bounds in C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an array of 5 integers.

C

int numbers[[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.

Using a size larger than needed.

The array size must be 5 to hold exactly 5 integers.

2fill in blank

medium

Complete the code to access the third element of the array.

C

int third = numbers[[1]];

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

A2

B3

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 3 as index which is out of bounds for third element.

Confusing element number with index.

Array indexes start at 0, so the third element is at index 2.

3fill in blank

hard

Fix the error in the code to avoid accessing out of bounds.

C

for (int i = 0; i < [1]; i++) {
    printf("%d\n", numbers[i]);
}

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

A0

B5

C10

D6

Attempts:

3 left

💡 Hint

Common Mistakes

Using i <= 5 which tries to access numbers[5] out of bounds.

Using a larger number than array size.

The loop should run while i is less than 5 to stay within array bounds.

4fill in blank

hard

Fill both blanks to create an array of 4 integers and assign 10 to the last element.

C

int arr[[1]];
arr[[2]] = 10;

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 for size 4.

Using size 3 which is too small.

The array size is 4, so the last element index is 3 (since indexing starts at 0).

5fill in blank

hard

Fill all three blanks to declare an array of 6 integers, assign 20 to the first element, and print it.

C

int nums[[1]];
nums[[2]] = 20;
printf("%d\n", nums[[3]]);

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

A6

B0

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 1 or 5 instead of 0 for first element.

Using wrong array size.

The array size is 6. The first element is at index 0, so assign and print nums[0].