Constant patterns in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the variable value equals 10 using a constant pattern.

C Sharp (C#)

if (value is [1]) {
    Console.WriteLine("Value is 10");
}

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

A"10"

B10

Cvalue

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the number, which makes it a string.

Using the variable name instead of a constant.

Using a boolean value instead of a constant.

The constant pattern checks if the variable matches the constant value 10.

2fill in blank

medium

Complete the code to print a message when input equals the character 'A' using a constant pattern.

C Sharp (C#)

if (input is [1]) {
    Console.WriteLine("Input is A");
}

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

A'A'

B"A"

CA

D'a'

Attempts:

3 left

💡 Hint

Common Mistakes

Using double quotes which makes it a string.

Using uppercase without quotes.

Using lowercase character instead of uppercase.

The constant pattern for a character uses single quotes around the character.

3fill in blank

hard

Fix the error in the code to correctly check if status equals the boolean constant true using a constant pattern.

C Sharp (C#)

if (status is [1]) {
    Console.WriteLine("Status is true");
}

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

A"true"

BTrue

Ctrue

DTRUE

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase True or TRUE which are invalid.

Using quotes which makes it a string.

Using incorrect casing.

The boolean constant true is lowercase in C# and used directly in the pattern.

4fill in blank

hard

Fill both blanks to check if number is either 0 or 1 using constant patterns in a switch expression.

C Sharp (C#)

string result = number switch {
    [1] => "Zero",
    [2] => "One",
    _ => "Other"
};

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

A0

B1

C"0"

D"1"

Attempts:

3 left

💡 Hint

Common Mistakes

Using string constants instead of numeric constants.

Mixing quotes and no quotes incorrectly.

Using wrong numbers.

Use numeric constants 0 and 1 without quotes for constant patterns in switch expressions.

5fill in blank

hard

Fill all three blanks to create a switch expression that returns a message for grade being 'A', 'B', or any other character using constant patterns.

C Sharp (C#)

string message = grade switch {
    [1] => "Excellent",
    [2] => "Good",
    [3] => "Needs Improvement"
};

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

A'A'

B'B'

C_

D'C'

Attempts:

3 left

💡 Hint

Common Mistakes

Using double quotes for characters.

Not using the discard pattern for the default case.

Using wrong characters.

Use character constants with single quotes for 'A' and 'B', and the discard pattern '_' for any other value.