using System;

//Professor Class

public class Professor

{

    // [Code] Define Fields

    public string ProfessorName;

    private int _Age;

    private string _Degree;

    // [Code] Define Property Age

    public int Age

    {

        get

        {

            return _Age;

        }

        set

        {

            if (value < 70 && value > 18)

            {

                _Age = value;

            }

            else

            {

                _Age = 30;

            }

        }

    }

    // Make sure Age is between 18 and 70

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

    // [Code] Define Property Degree

    public string Degree

    {

        get

        {

            return _Degree;

        }

        set

        {

            if (value.Equals("master") == true || value.Equals("phd") == true)

            {

                _Degree = value;

            }

            else

            {

                _Degree = "master";

            }

        }

    }

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

​

    // [Code] Constructor

    public Professor()

    {

    }

}

​

//Course Class

public class Course

{

    // [Code] Define Fields

    public string CourseName;

    private int _ClassCapacity;

    private string _CourseID;

    // [Code] Properties CourseID

    public int ClassCapacity

    {

        get

        {

            return _ClassCapacity;

        }

        set

        {

            if (value > 50)

            {

                _ClassCapacity = 50;

            }

            else if (value < 1)

            {

                _ClassCapacity = 1;

            }

            else

            {

                _ClassCapacity = value;

            }

        }

    }

    public string CourseID

    {

        get

        {

            return _CourseID;

        }

        set

        {

            if (value.Length == 4)

            {

                _CourseID = value;

            }

        }

    }

    // Make sure CourseID has exactly 4 characters

​

    // [Code] Properties ClassLimit

    // Make sure ClassLimit is under 50

​

    // [Code] Constructor

    public Course()

    {

    }

}

​

public class Program

{

    public static void Main()

    {

        //[Code] Create an object ProfessorTuna

        // ProfessorName: Tuna

        // Age: 99

        Professor professor1 = new Professor();

        professor1.ProfessorName = "Tuna";

        professor1.Age = 99;

​

        //[Code] Create an object CourseS308

        // CourseID: S308

        // CourseName: C#

        // ClassCapacity: 21

        Course course1 = new Course();

        course1.CourseID = "S308";

        course1.CourseName = "C#";

        course1.ClassCapacity = 21;     

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

        Console.WriteLine("Professor age: " + professor1.Age + " <- Defaults to 30 since 99 is outside the range.");

        Console.WriteLine("Class capacity: " + course1.ClassCapacity);

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

    }

}