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 (value.Equals("master") || value.Equals("phd")) {

                _Degree = value;

            } else {

                _Degree = "master";

            }

        }

    }

​

    // [Code] Constructor

    public Professor(){

        ProfessorName = "";

        _Degree = "master";

        _Age = 30;

    }

}

​

//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 {

                _CourseID = value.Substring(0,4);

            }

        }

    }

​

    // [Code] Properties ClassCapacity 

    // Make sure ClassLimit is under 50 abd above 1

    private int _ClassCapacity;

    public int ClassCapacity {

        get {

            return _ClassCapacity;

        } 

        set {

            if (value <= 1) {

                _ClassCapacity = 1;

            } else if (value >= 50) {

                _ClassCapacity = 50;

            } else {

                _ClassCapacity = value;

            }

        }

    }

​

    // [Code] Constructor

    public Course() {

        CourseName = "";

        _ClassCapacity = 1;

        _CourseID = "0000";

    }

}

​

public class Program

{

    public static void Main()

    {

        //[Code] Create an object ProfessorTuna

        // ProfessorName: Tuna

        // Age: 99

        Professor p1 = new Professor();

        p1.ProfessorName = "Tuna";

        p1.Age = 99;

​

        //[Code] Create an object CourseS308

        // CourseID: S308

        // CourseName: C#

        // ClassCapacity: 21

        Course c1 = new Course();

        c1.CourseID = "S308";

        c1.CourseName = "C#";

        c1.ClassCapacity = 21;

​

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

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

        Console.WriteLine(p1.Age);

        Console.WriteLine(c1.ClassCapacity);

    }

}