Constants and readonly fields in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a constant integer named MaxValue with value 100.

C Sharp (C#)

public class Config {
    public const int MaxValue = [1];
}

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Aint

Breadonly

CMaxValue

D100

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'readonly' instead of a value.

Not assigning a value to the constant.

The keyword const declares a constant value that cannot change. Here, MaxValue is set to 100.

2fill in blank

medium

Complete the code to declare a readonly field named creationTime initialized in the constructor.

C Sharp (C#)

public class Logger {
    public readonly DateTime creationTime;

    public Logger() {
        creationTime = [1];
    }
}

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ADateTime

Breadonly

CDateTime.Now

Dnew DateTime()

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to assign a type name instead of a value.

Using 'readonly' keyword as a value.

The readonly field creationTime can be assigned in the constructor. DateTime.Now gives the current time.

3fill in blank

hard

Complete the code to initialize the readonly field named configName in the constructor.

C Sharp (C#)

public class Settings {
    public readonly string configName;

    public Settings(string name) {
        configName = [1];
    }
}

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Aname

B"default"

Cthis.name

DconfigName

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string literal instead of the parameter.

Using 'this.name' which does not refer to the parameter.

The readonly field configName can only be assigned at declaration or inside constructors. Assign the constructor parameter name to it.

4fill in blank

hard

Fill both blanks to declare a constant double Pi and a readonly double radius initialized in the constructor.

C Sharp (C#)

public class Circle {
    public const double Pi = [1];
    public readonly double radius;

    public Circle(double r) {
        radius = [2];
    }
}

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A3.14159

Br

Cradius

D3.14

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning radius to itself instead of the parameter.

Using an incorrect value for Pi.

Pi is a constant set to 3.14159. The readonly field radius is assigned the constructor parameter r.

5fill in blank

hard

Fill all three blanks to declare a constant int MaxScore, a readonly int currentScore initialized in the constructor, and a method returning their sum.

C Sharp (C#)

public class Game {
    public const int MaxScore = [1];
    public readonly int currentScore;

    public Game(int score) {
        currentScore = [2];
    }

    public int TotalScore() {
        return MaxScore + [3];
    }
}

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A100

Bscore

CcurrentScore

D50

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect variable names in the return statement.

Assigning readonly fields outside constructor.

MaxScore is a constant set to 100. The readonly field currentScore is assigned the constructor parameter score. The method TotalScore returns the sum of MaxScore and currentScore.