One-dimensional arrays in C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an integer array named numbers with 5 elements.

C

int [1][5];

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Anumbers

Bnum

Carray

Dlist

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name different from 'numbers'.

Forgetting the array size in the declaration.

The correct way to declare an integer array named 'numbers' with 5 elements is int numbers[5];.

2fill in blank

medium

Complete the code to assign the value 10 to the third element of the array numbers.

C

numbers[[1]] = 10;

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A1

B2

C3

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 3 as the index which is actually the fourth element.

Using 1 which is the second element.

Array indices in C start at 0, so the third element is at index 2.

3fill in blank

hard

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

C

printf("%d", numbers[1]);

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A[1]

B(0)

C[0]

D(1)

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets.

Using index 1 instead of 0.

To access the first element of an array in C, use square brackets with index 0: numbers[0].

4fill in blank

hard

Fill both blanks to create a loop that prints all elements of the array numbers of size 5.

C

for(int [1] = 0; [2] < 5; [1]++) {
    printf("%d\n", numbers[[1]]);
}

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

Ai

Bj

Ccount

Dindex

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in the loop parts.

Using a variable name not matching the one in the printf statement.

The loop variable should be the same in initialization, condition, and increment. 'i' is commonly used.

5fill in blank

hard

Fill all three blanks to declare, initialize, and print the first element of an integer array arr with values 1, 2, 3.

C

int [1][] = [2];
printf("%d", [3][0]);

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

Aarr

B{1, 2, 3}

Cnumbers

D{3, 2, 1}

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for the array in declaration and print.

Incorrect array initialization syntax.

Declare the array as 'int arr[] = {1, 2, 3};' and print the first element with 'arr[0]'.