Optional parameters in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a method with an optional parameter.

C Sharp (C#)

void Greet(string name, string greeting = [1]) {
    Console.WriteLine($"{greeting}, {name}!");
}

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

A"Hey"

B"Welcome"

C"Hi"

D"Hello"

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to assign a default value to the optional parameter.

Using a variable instead of a constant as the default value.

The optional parameter greeting is given a default value "Hello". This means if no argument is passed for greeting, it uses "Hello".

2fill in blank

medium

Complete the code to call the method using the optional parameter.

C Sharp (C#)

Greet("Alice", [1]);

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

A"Good morning"

BGood morning

CHello

Dgreeting

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a string without quotes.

Passing the parameter name instead of a value.

When calling the method, the optional parameter can be passed as a string literal in quotes.

3fill in blank

hard

Fix the error in the method declaration with an optional parameter.

C Sharp (C#)

void Display(int count, string message [1]) {
    Console.WriteLine($"{message}: {count}");
}

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

A== "Default"

B: "Default"

C= "Default"

D=> "Default"

Attempts:

3 left

💡 Hint

Common Mistakes

Using : or => instead of = for default values.

Omitting the default value assignment.

Optional parameters require an equals sign (=) followed by the default value.

4fill in blank

hard

Fill both blanks to declare a method with two optional parameters.

C Sharp (C#)

void ShowInfo(string name, int age = [1], string city = [2]) {
    Console.WriteLine($"{name}, {age}, {city}");
}

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

A30

Bnull

C"Unknown"

D"None"

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around integer default values.

Not using quotes around string default values.

The optional parameters age and city have default values 30 and "Unknown" respectively.

5fill in blank

hard

Fill all three blanks to call the method using named and optional parameters.

C Sharp (C#)

ShowInfo(name: [1], city: [2], age: [3]);

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

A"Bob"

B"Paris"

C25

D"Alice"

Attempts:

3 left

💡 Hint

Common Mistakes

Using unnamed arguments in the wrong order.

Forgetting quotes around string arguments.

The method is called with named arguments: name="Alice", city="Paris", age=25.