Why Arrays Exist and What Problem They Solve in DSA C - Test Your Knowledge

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an array of 5 integers.

DSA C

int numbers[[1]];

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A10

B5

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero as the size, which creates an empty array.

Forgetting to specify the size.

The number inside the brackets specifies the size of the array. Here, 5 means the array can hold 5 integers.

2fill in blank

medium

Complete the code to access the third element of the array named 'data'.

DSA C

int value = data[1];

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A[2]

B[1]

C[3]

D[0]

Attempts:

3 left

💡 Hint

Common Mistakes

Using index 3 for the third element, which is actually the fourth element.

Using index 1 which is the second element.

Array indexing starts at 0, so the third element is at index 2.

3fill in blank

hard

Fix the error in the code to correctly initialize an array with values 1, 2, 3.

DSA C

int arr[3] = [1]1, 2, 3[2];

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A{

B[

C(

D}

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or square brackets instead of curly braces.

Forgetting to close the initializer with a brace.

Arrays in C are initialized using curly braces { } around the values.

4fill in blank

hard

Fill both blanks to create a loop that prints all elements of an array 'arr' of size 4.

DSA C

for(int i = 0; i [1] 4; i[2]) {
    printf("%d\n", arr[i]);
}

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A<

B<=

C++

D--

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= 4 causes out-of-bounds access.

Using -- causes an infinite loop.

The loop runs while i is less than 4, and i is incremented by 1 each time using ++.

5fill in blank

hard

Fill all three blanks to declare an array 'scores', assign 10 to the first element, and print it.

DSA C

int scores[3];
scores[1] = [2];
printf("%d", scores[3]);

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A[0]

B10

D[1]

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong indices like [1] instead of [0].

Forgetting to assign a value before printing.

Arrays use square brackets to access elements. The first element is at index 0. We assign 10 to scores[0] and print scores[0].