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Object-Oriented Programming: Inheritance with Person, Student, and Teacher Classes in C#

In this exercise, you will practice object-oriented programming (OOP) concepts by implementing inheritance in C#. You will create a base class named "Person" and derive two subclasses, "Student" and "Teacher". The "Student" class will have a method to indicate when they are attending classes, while the "Teacher" class will have a method to explain a subject. Additionally, attributes and methods will be used to store and display the age of each person. Finally, you will create a test class to instantiate and interact with these objects.



Group

Object-Oriented Programming in C#

Objective

1. Define a base class "Person" with a method "SetAge" to set the person's age.
2. Create a derived class "Student" with a method "GoToClasses" and "ShowAge" to display the age.
3. Create another derived class "Teacher" with a private field "subject" and a method "Explain" to show an explanation message.
4. Implement a test class "StudentAndTeacherTest" with a Main method to create objects of these classes and test their functionality.

Write a C# program that includes the class Person. Create a class "Student" and another class "Teacher", both inheriting from "Person".

Example: 

Hello!

Hello!

My age is: 21 years old.

I'm going to class.

Hello!

Explanation begins.

Example C# Exercise

 Copy C# Code 
using System;

class Person
{
    protected int age; // Age of the person

    // Method to set the age of the person
    public void SetAge(int n)
    {
        age = n;
    }

    // Method to greet
    public void Greet()
    {
        Console.WriteLine("Hello!"); // Prints a greeting message
    }
}

// Student class inherits from Person
class Student : Person
{
    // Method to indicate the student is going to class
    public void GoToClasses()
    {
        Console.WriteLine("I'm going to class.");
    }

    // Method to display the student's age
    public void ShowAge()
    {
        Console.WriteLine("My age is: " + age + " years old.");
    }
}

// Teacher class inherits from Person
class Teacher : Person
{
    private string subject; // Private field to store the subject taught

    // Method to start explaining a subject
    public void Explain()
    {
        Console.WriteLine("Explanation begins.");
    }
}

// Test class to demonstrate functionality
class StudentAndTeacherTest
{
    static void Main()
    {
        // Creating a Person instance
        Person person = new Person();
        person.Greet(); // Person says hello

        // Creating a Student instance
        Student student = new Student();
        student.SetAge(21); // Setting age of student to 21
        student.Greet(); // Student says hello
        student.ShowAge(); // Displaying student's age
        student.GoToClasses(); // Student goes to class

        // Creating a Teacher instance
        Teacher teacher = new Teacher();
        teacher.SetAge(30); // Setting teacher's age to 30
        teacher.Greet(); // Teacher says hello
        teacher.Explain(); // Teacher starts explaining
    }
}

 Output

Hello!
Hello!
My age is: 21 years old.
I'm going to class.
Hello!
Explanation begins.

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