public string ProfessorName;
if (value < 70 && value > 18)
if (value.Equals("master") == true || value.Equals("phd") == true)
public string CourseName;
private int _ClassCapacity;
private string _CourseID;
public static void Main()
Professor professor1 = new Professor();
professor1.ProfessorName = "Tuna";
Course course1 = new Course();
course1.CourseID = "S308";
course1.CourseName = "C#";
course1.ClassCapacity = 21;
Console.WriteLine("Professor age: " + professor1.Age + " <- Defaults to 30 since 99 is outside the range.");
Console.WriteLine("Class capacity: " + course1.ClassCapacity);