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();
}
