Switch expression (modern C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return the string "One" when number is 1 using a switch expression.

C Sharp (C#)

string result = number switch [1];
// number is an int variable

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A{ 1 => "One", _ => "Other" }

B( 1 => "One", _ => "Other" )

C[ 1 => "One", _ => "Other" ]

D< 1 => "One", _ => "Other" >

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses or brackets instead of curly braces for switch expression.

Forgetting the default case with underscore (_).

The switch expression uses curly braces with pattern cases like { 1 => "One", _ => "Other" }.

2fill in blank

medium

Complete the switch expression to return "Even" if the number is divisible by 2, otherwise "Odd".

C Sharp (C#)

string parity = number switch
{
    [1] => "Even",
    _ => "Odd"
};

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Avar n when n % 2 == 0

Bvar n if n % 2 == 0

Cvar n where n % 2 == 0

Dvar n in n % 2 == 0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'where' or 'if' instead of 'when' in the pattern.

Incorrect syntax causing compile errors.

The correct syntax for a pattern with condition is 'var n when n % 2 == 0'.

3fill in blank

hard

Fix the error in the switch expression to correctly return the day type for a given day string.

C Sharp (C#)

string dayType = day switch
{
    "Saturday" or [1] => "Weekend",
    _ => "Weekday"
};

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Asunday

BSunday

C'Sunday'

D"Sunday"

Attempts:

3 left

💡 Hint

Common Mistakes

Using single quotes for strings.

Using unquoted identifiers instead of string literals.

String literals in C# must be enclosed in double quotes, so "Sunday" is correct.

4fill in blank

hard

Fill both blanks to complete the switch expression that returns a message based on the score.

C Sharp (C#)

string message = score switch
{
    [1] when score >= 90 => "Excellent",
    [2] when score >= 60 => "Pass",
    _ => "Fail"
};

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Avar s

Bvar x

Cvar score

Dvar result

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same variable name for both patterns causing confusion.

Using invalid variable names or missing 'var'.

The pattern variable can be any valid identifier; here 'var s' and 'var x' are used for the two cases.

5fill in blank

hard

Fill all three blanks to create a switch expression that returns a grade letter based on the numeric score.

C Sharp (C#)

char grade = score switch
{
    [1] when score >= 90 => 'A',
    [2] when score >= 80 => 'B',
    [3] when score >= 70 => 'C',
    _ => 'F'
};

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Avar s

Bvar x

Cvar y

Dvar z

Attempts:

3 left

💡 Hint

Common Mistakes

Reusing the same variable name in multiple patterns.

Omitting 'var' keyword.

Each pattern uses 'var' with a unique variable name: 'var z', 'var x', and 'var y' respectively.