Default values for types in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to assign the default value of an int variable.

C Sharp (C#)

int number = [1];

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

Adefault(int)

B0

Cnull

Dint()

Attempts:

3 left

💡 Hint

Common Mistakes

Using null for value types like int causes errors.

Using 0 directly is correct but the task asks for default keyword.

In C#, default(int) returns the default value for the int type, which is 0.

2fill in blank

medium

Complete the code to assign the default value of a bool variable.

C Sharp (C#)

bool isActive = [1];

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

Atrue

Bnull

Cdefault(bool)

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using null for bool causes errors because bool is a value type.

Using true is not the default value.

default(bool) returns false, the default value for bool.

3fill in blank

hard

Fix the error in the code to assign the default value of a string variable.

C Sharp (C#)

string name = [1];

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

A""

Bdefault(string)

Cnull

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 causes a type error.

Using empty string "" is not the default value.

Using default(string) assigns null which is the default for reference types like string.

4fill in blank

hard

Fill both blanks to create a method that returns the default value of a generic type T.

C Sharp (C#)

public T GetDefaultValue<[1]>() {
    return [2];
}

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

AT

Bdefault(T)

Cvoid

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using void as a generic type parameter is invalid.

Returning null may cause errors for value types.

The generic type parameter is T, and default(T) returns its default value.

5fill in blank

hard

Fill all three blanks to create a dictionary with keys as strings and values as default values of type int.

C Sharp (C#)

var defaults = new Dictionary<string, int> {
    {"one", [1],
    {"two", [2],
    {"three", [3]
};

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

Adefault(int)

B0

Cdefault

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using null causes errors because int is a value type.

Using 0 is correct but the task asks for default keyword.

Using default(int) assigns the default int value 0 to each dictionary entry.