public Person(string name, int age)
public abstract void SayHello();
public Bulgarian(string name, int age) : base(name, age)
public override void SayHello()
Console.WriteLine("Zdraveite");
public German(string name, int age) : base(name, age)
public override void SayHello()
Console.WriteLine("Hallo");
public static void Main(string[] args)
Person german = new German("Olga", 20);
Person bulgarian = new Bulgarian("Dimitur", 20);