static void Main()
{
Turtle turtle = new Turtle();
Console.WriteLine(turtle);
Console.WriteLine("The {0} can go {1} km/h ",
turtle.GetName(), turtle.Speed);
Console.WriteLine();
Cheetah cheetah = new Cheetah();
Console.WriteLine(cheetah);
Console.WriteLine("The {0} can go {1} km/h ",
cheetah.GetName(), cheetah.Speed);
Console.WriteLine();
Tomcat tomcat = new Tomcat();
Console.WriteLine(tomcat);
Console.WriteLine("The {0} can go {1} km/h ",
tomcat.GetName(), tomcat.Speed);
tomcat.SayMyaau();
Console.WriteLine();
Kitten kitten = new Kitten();
Console.WriteLine(kitten);
Console.WriteLine("The {0} can go {1} km/h ",
kitten.GetName(), kitten.Speed);
kitten.SayMyaau();
Console.WriteLine(turtle.CompareTo(kitten));
// This wil not compile (Cat is abstract -> cannot be instantiated)
//Cat cat = new Cat();
}