Character arrays in C++ - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a character array named name with space for 10 characters.

C++

char name[[1]];

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

A10

Bchar

C5

Dstring

Attempts:

3 left

💡 Hint

Common Mistakes

Using a data type like 'char' or 'string' inside the brackets instead of a number.

Forgetting to specify the size of the array.

The code declares a character array name with space for 10 characters using char name[10];.

2fill in blank

medium

Complete the code to initialize the character array word with the string "hello".

C++

char word[] = [1];

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

A'hello'

B"hello"

Chello

D'h','e','l','l','o'

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes instead of double quotes for strings.

Not enclosing the string in any quotes.

To initialize a character array with a string, use double quotes like "hello". Single quotes are for single characters.

3fill in blank

hard

Fix the error in the code to correctly print the first character of the array letters.

C++

char letters[] = {'a', 'b', 'c'};
std::cout << letters[1] << std::endl;

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A[0]

B(0)

C{0}

D<0>

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or curly braces instead of square brackets.

Using an incorrect index like 1 instead of 0.

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

4fill in blank

hard

Fill both blanks to create a loop that prints each character in the array chars until the null character is found.

C++

char chars[] = {'C', '+', '+', '\0'};
for (int i = [1]; chars[i] [2] '\0'; i++) {
    std::cout << chars[i];
}

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

A0

B1

C!=

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Starting the loop at 1 instead of 0.

Using '==' instead of '!=' in the loop condition.

The loop starts at index 0 and continues while the character is not the null character '\0'.

5fill in blank

hard

Fill all three blanks to create a character array greeting initialized with "Hi!" and print its length excluding the null character.

C++

char greeting[] = [1];
int length = 0;
while (greeting[2] != '\0') {
    [3];
}
std::cout << length << std::endl;

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

A"Hi!"

B[length]

C++length

D[length++]

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes for the string initialization.

Not incrementing the length variable correctly.

Using the wrong index syntax in the while condition.

The array is initialized with "Hi!". The loop uses greeting[length] to check each character until the null character and increments length with ++length.