Readonly structs in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a readonly struct named Point.

C Sharp (C#)

public [1] struct Point { public int X; public int Y; }

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

Areadonly

Bstatic

Csealed

Dabstract

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'static' or 'sealed' instead of 'readonly'.

The readonly keyword makes the struct immutable after creation.

2fill in blank

medium

Complete the code to create a readonly property in the readonly struct.

C Sharp (C#)

public readonly struct Rectangle { public int Width { [1]; } }

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

Aset

Binit

Cget

Dprivate set

Attempts:

3 left

💡 Hint

Common Mistakes

Adding a 'set' accessor to a readonly property.

Readonly properties in readonly structs only have a get accessor.

3fill in blank

hard

Fix the error in the readonly struct method that tries to modify a field.

C Sharp (C#)

public readonly struct Circle { public int Radius; public void SetRadius(int r) { [1] = r; } }

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

ARadius

Bthis.Radius

Creadonly Radius

Dbase.Radius

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to assign to fields without 'this' or in readonly structs.

In a readonly struct, to modify a field inside a method, you must use this explicitly, but modification is not allowed; the method should be removed or the struct not readonly.

4fill in blank

hard

Fill both blanks to create a readonly struct with a constructor initializing its fields.

C Sharp (C#)

public [1] struct Vector2D { public int X; public int Y; public [2] Vector2D(int x, int y) { X = x; Y = y; } }

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

Areadonly

Bstatic

CVector2D

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'static' instead of 'readonly' or wrong constructor name.

The struct must be declared readonly and the constructor has the same name as the struct.

5fill in blank

hard

Fill all three blanks to create a readonly struct with a method that returns the distance from origin.

C Sharp (C#)

public [1] struct Point3D { public int X; public int Y; public int Z; public double [2]() { return Math.[3](X * X + Y * Y + Z * Z); } }

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

Areadonly

BDistanceFromOrigin

CSqrt

Dstatic

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'static' for the struct or wrong method name or math function.

The struct is readonly, the method is named DistanceFromOrigin, and it uses Math.Sqrt to calculate distance.