static void Main(string[] args) { Instructor mike = new Instructor("Mike", "English"); Instructor john = new Instructor("John", "Math"); Student jane = new Student("Jane", john); Student joe = new Student("Joe", john); Student melissa = new Student("Melissa", mike); Student matt = new Student("Matt", mike); john.ChangeGrade(jane, 95); john.ChangeGrade(joe, 85); mike.ChangeGrade(melissa, 90); mike.ChangeGrade(matt, 92); System.Console.WriteLine(""); jane.PrintStudent(); joe.PrintStudent(); melissa.PrintStudent(); matt.PrintStudent(); System.Console.ReadKey(); }