using System;

//Professor Class

public class Professor

{

    // [Code] Define Fields

    public string ProfessorName;

​

    // [Code] Define Property Age

    // Make sure Age is between 18 and 70

    // If Age violates the rule, set the default value as 30

    private int _Age;

    public int Age

    {

        get { return _Age;}

        set {

                if(value >=18 && value <=70)

                    _Age = value;

                else {

                    int intdefault = 30;

                    Console.WriteLine("{0} Age is incorrect setting value to {1}", value, intdefault);

                    _Age = intdefault;

                     }  

            }

    }

​

    // [Code] Define Property Degree

    // The degree's value should only equal to "master" or "phd".

    private string _Degree;

    public string Degree

    {

        get { return _Degree;}

        set 

        { 

            switch (value)

            {

                case "master": _Degree = value; break;

                case "phd": _Degree = value; break;

                default:

                    string defaultDegree = "master";

                    Console.WriteLine("Illegal Degree value {0} is ignored. Degree is set to \"{1}\".", 

                                      value, defaultDegree);

                    _Degree = defaultDegree;

                    break;

            }

        }

    }

​

    // [Code] Constructor

    public Professor()

    {

    }

}

​

//Course Class

public class Course

{

    // [Code] Define Fields

    public string CourseName;

    // [Code] Properties CourseID

    // Make sure CourseID has exactly 4 characters

    private string _CourseID;

    public string CourseID

    {

        get { return _CourseID;}

        set{

            if (value.Length ==4)

            _CourseID = value;

            else{

                Console.WriteLine("Value is not correct {0} is ignored", value);

                }

            }

    }

​

    // [Code] Properties ClassLimit

    // Make sure ClassLimit is under 50

    private int _Capacity;

    public int Capacity

    {

        get { return _Capacity;}

        set{

            if (value < 1) _Capacity = 1;

            else if (value > 50) _Capacity = 50;

            else _Capacity = value;

            }

    }

​

    // [Code] Constructor

    public Course()

    {

    }

}

​

public class Program

{

    public static void Main()

    {

        //[Code] Create an object ProfessorTuna

        // ProfessorName: Tuna

        // Age: 99

        Professor prof = new Professor();

        prof.ProfessorName = "Tuna";

        prof.Age = 99;

​

        //[Code] Create an object CourseS308

        // CourseID: S308

        // CourseName: C#

        // ClassCapacity: 21

        Course course = new Course();

        course.CourseID = "S308";

        course.CourseName = "C#";

        course.Capacity = 71;

​

        // [Code] Show professor's age and course capacity

        // What happens if the age is greater than 70?

        Console.WriteLine("Age is: " + prof.Age + ", Capacity is: " +course.Capacity);

    }

}