Access modifiers (public, private, internal) in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to make the field accessible from anywhere.

C Sharp (C#)

class MyClass {
    [1] int number;
}

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

Aprivate

Bprotected

Cpublic

Dinternal

Attempts:

3 left

💡 Hint

Common Mistakes

Using private makes the member accessible only inside the class.

Internal restricts access to the same assembly.

The public modifier makes the member accessible from any other code.

2fill in blank

medium

Complete the code to restrict access to the method only within the same assembly.

C Sharp (C#)

class Calculator {
    [1] int Add(int a, int b) {
        return a + b;
    }
}

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

Ainternal

Bpublic

Cprivate

Dprotected

Attempts:

3 left

💡 Hint

Common Mistakes

Using private restricts access only to the class itself.

Public allows access from anywhere, which is too broad here.

The internal modifier restricts access to the same assembly.

3fill in blank

hard

Complete the code to make the field accessible only inside the class.

C Sharp (C#)

class Person {
    [1] string name;

    public Person(string name) {
        this.name = name;
    }
}

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

Aprivate

Bpublic

Cinternal

Dprotected

Attempts:

3 left

💡 Hint

Common Mistakes

Using public exposes the field to all classes.

Internal allows access from the same assembly, which is broader than needed.

The private modifier restricts access to inside the class only, which is correct for encapsulation.

4fill in blank

hard

Fill in the blank to declare a method accessible only within the class and its derived classes, but not outside.

C Sharp (C#)

using System;

class Animal {
    [1] void Speak() {
        Console.WriteLine("Animal sound");
    }
}

class Dog : Animal {
    public void Bark() {
        Speak();
    }
}

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

Aprivate

Bprotected

Cpublic

Dinternal

Attempts:

3 left

💡 Hint

Common Mistakes

Using private restricts access only to the class itself.

Public allows access from anywhere, which is too broad.

The protected modifier allows access inside the class and its subclasses, but not outside.

5fill in blank

hard

Fill all three blanks to create a class with a private field, an internal method, and a public method.

C Sharp (C#)

class BankAccount {
    [1] decimal balance;

    [2] void UpdateBalance(decimal amount) {
        balance += amount;
    }

    [3] decimal GetBalance() {
        return balance;
    }
}

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

Aprivate

Binternal

Cpublic

Dprotected

Attempts:

3 left

💡 Hint

Common Mistakes

Making balance public exposes it directly.

Using private for UpdateBalance restricts it too much.

Using internal for GetBalance limits access unnecessarily.

The field is private to hide it, the update method is internal to allow access within the assembly, and the getter is public to allow access from anywhere.