Why encapsulation matters in C Sharp (C#) - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a private field in a class.

C Sharp (C#)

private int [1];

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

Avoid

Bpublic

Cage

Dclass

Attempts:

3 left

💡 Hint

Common Mistakes

Using a keyword like 'public' or 'class' as a field name.

Leaving the field name blank.

The keyword private makes the field accessible only inside the class. Here, age is the field name.

2fill in blank

medium

Complete the code to create a public method that returns the private field value.

C Sharp (C#)

public int GetAge() {
    return [1];
}

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

AGetAge

Bage

Cthis

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Returning the method name instead of the field.

Using 'void' as a return value.

The method returns the private field age. Using age directly returns its value.

3fill in blank

hard

Fix the error in the setter method to correctly assign the value to the private field.

C Sharp (C#)

public void SetAge(int value) {
    [1] = value;
}

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

Athis.value

Bvalue

CSetAge

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning the parameter to itself.

Using 'this.value' which is incorrect here.

The private field age should be assigned the incoming value. Using age = value; correctly updates the field.

4fill in blank

hard

Fill both blanks to create a property that encapsulates the private field.

C Sharp (C#)

public int Age {
    get { return [1]; }
    set { [2] = value; }
}

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

Aage

BAge

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using the property name inside getter or setter instead of the field.

Assigning the parameter to itself.

The property Age uses the private field age inside both getter and setter to encapsulate access.

5fill in blank

hard

Fill all three blanks to complete the class with encapsulation for the age field.

C Sharp (C#)

class Person {
    private int [1];

    public int [2] {
        get { return [3]; }
        set { [3] = value; }
    }
}

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

Aage

BAge

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using the property name inside its own getter or setter causing infinite recursion.

Not declaring the private field.

The private field age is encapsulated by the public property Age. The property uses the field age in its getter and setter.