using System;

public class Program

{

    public static void Main()

    {

        Emp e=new Emp();

        e.firstName="john";

        e.lastName="abrham";

        e.Email="Ja@gmail.com";

        e.Details();

         PartTimeEmp pte=new PartTimeEmp();

        pte.firstName="abc";

        pte.lastName="def";

        pte.Email="abc@gmail.com";

        pte.HourlyRate=1234.5F;

        pte.Details();

        FullTimeEmp fte=new FullTimeEmp();

        fte.Details();

        fte.YearlySalary=1234.67F;

    }

}

​

//base class or parent class

public class Emp

{

    public string firstName;

    public string lastName;

    public string Email;

    public void Details()

    {

        Console.WriteLine(firstName);

        Console.WriteLine(lastName);

        Console.WriteLine(Email);

    }   

}

//derived class or sub class or child class

public class PartTimeEmp:Emp

{

    public float HourlyRate;

​

}

​

public class FullTimeEmp:Emp

{   

    public float YearlySalary;

}