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 = 30;

            else _Age = value;

        }

    }

    // [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 (Convert.ToString(value) == "master" || Convert.ToString(value) == "phd") _degree = Convert.ToString(value);

            else Console.WriteLine("invalid degree");

        }

    }

    // [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("ID must be 4 characters");

        }

    }

    // [Code] Properties ClassLimit

    // Make sure ClassLimit is under 50

    private int _classLimit;

    public int classLimit

    {

        get

        {

            return _classLimit;

        }

        set

        {

            if(value >= 1 && value <= 50) _classLimit = value;

            else if(value < 1) _classLimit = 1;

            else _classLimit = 50;

        }

    }

    // [Code] Constructor

    public Course()

    {

    }

}

​

public class Program

{

    public static void Main()

    {

        //[Code] Create an object ProfessorTuna

        // ProfessorName: Tuna

        // Age: 99

        Professor esen = new Professor();

        esen.ProfessorName = "Tuna";

        esen.Age = 99;

        esen.degree = "master";

        Console.WriteLine("Professor Name = {0}", esen.ProfessorName);

        Console.WriteLine("Age = {0}", esen.Age);

        Console.WriteLine("Degree = {0}", esen.degree);

        //[Code] Create an object CourseS308

        // CourseID: S308

        // CourseName: C#

        // ClassCapacity: 21

        Course s308 = new Course();

        s308.courseID = "S308";

        s308.CourseName = "C#";

        s308.classLimit = 21;

        Console.WriteLine("Course ID = {0}", s308.courseID);

        Console.WriteLine("Course Name = {0}", s308.CourseName);

        Console.WriteLine("Class Capacity = {0}", s308.classLimit);

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

            //shown above

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

            //if age is greater than 70 it will return the set value of 30

    }

}