using System;

​

//Professor Class

​

public class Professor

{

    // [Code] Define Fields

    public string ProfessorName;

    // [Code] Define Property Age

    private int Age1;

    public int Age

    {

        get

        {

            return Age1;

        }

​

        set

        {

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

            {

                Age1 = value;

            }

            else

            {

                int ageDefault = 30;

                Age1 = ageDefault;

                Console.WriteLine("This is an illegal property value {0}. New value set to {1}", value, ageDefault);

            }

        }

    }

​

    // [Code] Define Property Degree

    private string Degree1;

    public string Degree

    {

        get

        {

            return Degree1;

        }

​

        set

        {

            if (value == "Master" || value == "PHD")

            {

                Degree1 = value;

            }

            else

            {

                Console.WriteLine("This is an illegal property value {0}. New value set to \"master\".");

                Degree1 = "master"; 

            }

        }

    }

​

    // [Code] Constructor

    public Professor()

    {

    }

}

​

​

//Course Class

​

public class Course

{

    // [Code] Define Fields

    public string CourseName;

    // [Code] Properties CourseID

    private string courseID1;

    public string courseID

    {

        get

        {

            return courseID1;

        }

​

        set

        {

            if (value.Length == 4)

            {

                courseID1 = value;

            }

            else

            {

                Console.WriteLine("This is an illegal property value {0}.", value);

            }

        }

    }

​

    // [Code] Properties ClassLimit

    private int classCapacity1;

    public int ClassCapacity

    {

        get

        {

            return classCapacity1;

        }

​

        set

        {

            if (value < 1)

                classCapacity1 = 1;

            else if (value > 50)

                classCapacity1 = 50;

            else

                classCapacity1 = value;

        }

    }

​

    // [Code] Constructor

    public Course()

    {

    }

}

​

public class Program

{

    public static void Main()

    {

        //[Code] Create an object ProfessorTuna

        Professor ProfessorTuna = new Professor();

        ProfessorTuna.ProfessorName = "Tuna";

        ProfessorTuna.Age = 99;

        //[Code] Create an object CourseS308

        Course CourseS308 = new Course();

        CourseS308.courseID = "S308";

        CourseS308.CourseName = "C#";

        CourseS308.ClassCapacity = 21;

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

        Console.WriteLine("Professor Tuna's Age is " + ProfessorTuna.Age);

        Console.WriteLine("Course S308 Class Capacity is " + CourseS308.ClassCapacity);

    }

}