static void Main(string[] args) { Student s1 = new Student("홍길동", 20, 201601); s1.PrintAll(); Student s2 = new Student("홍길순", 201602); s2.PrintAll(); Student s3 = new Student("나맹구"); s3.PrintAll(); Student s4 = new Student(); s4.PrintAll(); Console.WriteLine(); Teacher t1 = new Teacher("일강사", 30, "C#"); t1.PrintAll(); Teacher t2 = new Teacher("이강사", "C++"); t2.PrintAll(); Teacher t3 = new Teacher("삼강사"); t3.PrintAll(); Teacher t4 = new Teacher(); t4.PrintAll(); Console.WriteLine(); Employee e1 = new Employee("일직원", 25, 'A'); e1.PrintAll(); Employee e2 = new Employee("이직원", 'B'); e2.PrintAll(); Employee e3 = new Employee("삼직원"); e3.PrintAll(); Employee e4 = new Employee(); e4.PrintAll(); }