static void Main(string[] args)
{
//create one student object
Student student = new Student();
student.Firstname = "Seppo";
student.Lastname = "Terävä";
student.Address = "Kusipolku 1";
student.Age = 24;
student.PhoneNumber = "050 4040303030303";
student.StudentID = "k1977";
Console.WriteLine(student.ToString());
Teacher teacher = new Teacher("kirsi", "kernel", "D666");
teacher.Age = 35;
teacher.Address = "Piippukatu 2";
teacher.PhoneNumber = "404040404";
Console.WriteLine(teacher.ToString());
teacher.TeahcerMethod();
student.StudentMethod();
//Olio ei ole aliluokan sisällä
//student.PersonMethod();
}