using System;

//Professor Class

public class Professor

{

    // [Code] Define Fields

    public string ProfName;

​

    // [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 Age1;

    public int Age

    {

        get{return Age1; }

        set

        {

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

                Age1 = value;

            else {

                int default_age = 30;

                Console.WriteLine(value + " is not valid. Age set to default, " + default_age + ".");

                Age1 = default_age;

            }

        }

    }

​

    // [Code] Define Property Degree

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

    private string Degree1;

    public string Degree

    {

        get{return Degree1;}

        set

        {

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

                Degree1 = value;

            else {

                string default_Degree = "master";

                Console.WriteLine(value + " is not valid. Degree will be set to default, " + default_Degree + ".");

                Degree1 = default_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 CourseID1;

    public string CourseID

    {

        get {return CourseID1;}

        set

        {

            if (value.Length == 4)

                CourseID1 = value;

            else

            {

                Console.WriteLine("Course must be 4 characters");   

            }

        }

    }

    // [Code] Properties ClassLimit

    // Make sure ClassLimit is under 50

    private int ClassLimit1;

    public int ClassLimit

    {

        get{return ClassLimit1;}

        set

        {

            if(value < 1)

                ClassLimit1 = 1;

            else if (value > 50)

                ClassLimit1 = 50;

            else

                ClassLimit1 = value;

        }

    }

    // [Code] Constructor

    public Course()

    {

    }

}

​

public class Program

{

    public static void Main()

    {

        //[Code] Create an object ProfessorTuna

        // ProfessorName: Tuna

        // Age: 99

        Professor Prof1 = new Professor();

        Prof1.ProfName = "Tuna";

        Prof1.Age = 99;

​

        //[Code] Create an object CourseS308

        // CourseID: S308

        // CourseName: C#

        // ClassCapacity: 21

        Course Course1 = new Course();

        Course1.CourseID = "S308";

        Course1.ClassLimit = 21;

​

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

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

        Console.WriteLine("The Professor's age is " + Prof1.Age);

        Console.WriteLine("Class Capacity is " + Course1.ClassLimit);

    }

}