Пример #1
0
        static void Main(string[] args)
        {
            Person p1 = new Person();
            Student s1 = new Student();
            Teacher t1 = new Teacher();
            p1.Greet();
            s1.SetAge(21);
            s1.Greet();
            s1.ShowAge();
            t1.SetAge(30);
            t1.Greet();
            t1.Explain();

            Console.ReadKey();
        }