static void Main(string[] args) { Student student1 = new Student("Diego", "Caridei", new DateTime(1990, 10, 22), "*****@*****.**"); Student student2 = new Student("Michele", "Sannino", new DateTime(1950, 03, 12), "*****@*****.**"); Student student3 = new Student("Sara", "task", new DateTime(1985, 04, 03), "*****@*****.**"); ArrayList students = new ArrayList(); students.Add(student1); students.Add(student2); students.Add(student3); foreach (Student s in students) { for (int i = 0; i < 5; i++) { double grade = i + 5.53; s.addGrade(grade); } } Course course = new Course("Programming with C#", 15); course.addStudent(student1); course.addStudent(student2); course.addStudent(student3); foreach (Student s in students) { s.popGrade(); s.addGrade(10); } foreach (Student s in students) { double grade5 = s.popGrade(); double grade4 = s.popGrade(); s.popGrade(); s.addGrade(0); s.addGrade(grade4); s.addGrade(grade5); } course.listStudents(); Console.ReadKey(); }