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Test Case 1 >>>
Four wheels and an engine.
----------
Four wheels and an engine.
A roof that opens up.
----------
Four wheels and an engine.
Carries seven people.
----------
Test Case 2 >>>
Car object: YourApplication.Car
Four wheels and an engine.
----------
Car object: YourApplication.ConvertibleCar
Four wheels and an engine.
----------
Car object: YourApplication.Minivan
Four wheels and an engine.
Carries seven people.
----------

// Define the base class
class Car
{
    public virtual void DescribeCar()
    {
        System.Console.WriteLine("Four wheels and an engine.");
    }
}

// Define the derived classes
class ConvertibleCar : Car
{
    public new virtual void DescribeCar()
    {
        base.DescribeCar();
        System.Console.WriteLine("A roof that opens up.");
    }
}

class Minivan : Car
{
    public override void DescribeCar()
    {
        base.DescribeCar();
        System.Console.WriteLine("Carries seven people.");
    }
}

public static void TestCars1()
{

    System.Console.WriteLine("Test Case 1 >>>");

    Car car1 = new Car();
    car1.DescribeCar();
    System.Console.WriteLine("----------");

    ConvertibleCar car2 = new ConvertibleCar();
    car2.DescribeCar();
    System.Console.WriteLine("----------");

    Minivan car3 = new Minivan();
    car3.DescribeCar();
    System.Console.WriteLine("----------");
}


public static void TestCars2()
{
    System.Console.WriteLine("Test Case 2 >>>");
    Car[] cars = new Car[3];
    cars[0] = new Car();
    cars[1] = new ConvertibleCar();
    cars[2] = new Minivan();

    foreach (Car vehicle in cars)
    {
        System.Console.WriteLine("Car object: " + vehicle.GetType());
        vehicle.DescribeCar();
        System.Console.WriteLine("----------");
    }
}