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 

        {

            const int age_default = 25;

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

                _age = value;

            else

                _age = age_default; 

        }

    }

    // [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 

        {

            if ( value == "phd" || value == "master")

                _degree = value;

            else

            {

                Console.WriteLine("Degree value ({0}) is ignored", value);

                _degree = "master";

            }

        }

    }

    // [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 _id;

    public string CourseID

    {

        get { return _id;}

        set 

        {

            if (value.Length == 4)

                _id = value;

            else

            {

                Console.WriteLine("Invalid course id: ({0})", value);

                _id = "????";

            }

        }

    }

    // [Code] Properties ClassLimit

    // Make sure ClassLimit is under 50

    private int _limit;

    public int ClassCapacity

    {

        get { return _limit;}

        set 

        {

            const int min = 1;

            const int max = 50;

            if (value < min)

                _limit = min;

            else if (value > max)

                _limit = max;

            else

                _limit = value;

        }

    }

​

    // [Code] Constructor

    public Course()

    {

    }

}

​

public class Program

{

    public static void Main()

    {

        //[Code] Create an object ProfessorTuna

        // ProfessorName: Tuna

        // Age: 99

        Professor p = new Professor();

        p.ProfessorName = "Tuna";

        p.Age = 100;

        p.Degree = "diploma";

        Console.WriteLine(p.ProfessorName);

        Console.WriteLine(p.Age);

        Console.WriteLine(p.Degree);

​

        //[Code] Create an object CourseS308

        // CourseID: S308

        // CourseName: C#

        // ClassCapacity: 21

        Course courseS308 = new Course();

        courseS308.CourseID = "S308";

        courseS308.CourseName = "C#";

        courseS308.ClassCapacity = 21;  

        Console.WriteLine(courseS308.CourseID);

        Console.WriteLine(courseS308.CourseName);

        Console.WriteLine(courseS308.ClassCapacity);

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

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

            //if age greater than 70 it gets set to the default value of 25

    }

}