Value type vs reference type performance in C Sharp (C#) - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a value type struct.

C Sharp (C#)

public struct [1] { public int Number; }

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

AMyInterface

BMyEnum

CMyClass

DMyStruct

Attempts:

3 left

💡 Hint

Common Mistakes

Using class instead of struct to declare a value type.

The struct keyword declares a value type in C#.

2fill in blank

medium

Complete the code to create a reference type instance.

C Sharp (C#)

MyClass obj = new [1]();

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AMyClass

Bstruct

Cint

Denum

Attempts:

3 left

💡 Hint

Common Mistakes

Using a keyword like struct instead of the class name.

To create an instance of a class (reference type), use the class name with new.

3fill in blank

hard

Fix the error in the code to correctly copy a value type.

C Sharp (C#)

MyStruct copy = original[1];

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A=>

B==

C=

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using comparison operator == instead of assignment =.

Use the assignment operator = to copy value types.

4fill in blank

hard

Fill both blanks to create a method that accepts a value type and returns a modified copy.

C Sharp (C#)

public MyStruct Modify([1] input) { input.Number [2] 10; return input; }

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AMyStruct

BMyClass

C+=

D-=

Attempts:

3 left

💡 Hint

Common Mistakes

Using a reference type as parameter instead of value type.

Using subtraction -= instead of addition.

The method takes a value type MyStruct and adds 10 to its Number field using +=.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps strings to their lengths if length is greater than 3.

C Sharp (C#)

var lengths = words.Where(word => word.Length [3] 3).ToDictionary([1] => [1], [1] => [2]);

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

Aword

Bword.Length

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using length as key instead of word.

Using less than operator instead of greater than.

The dictionary maps each word to its word.Length only if the length is greater than 3.