using System;

​

public class Professor//class

{

    //field

    public string ProfessorName;

    private int _iAge;

    public int iAge

    {

        get

        {

            return _iAge;

        }

        set

        {

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

            {

                _iAge= value;

            }

            else {

                _iAge=30;//default is 30

            }

        }

    }   

    private string _Degree;

    public string Degree

    {

        get

        {

            return _Degree;

        }

        set

        {

            if (value.Length>=3)

            {

                _Degree=value;

            }

            else {

                _Degree="Masters";//default is Masters

            }

        }

    }

    //constructor

    public Professor()//same as class

    {

    }

}   

public class ProfObject

{

    public static void Main()

    {

        //object

        Professor Professor1= new Professor();

        Professor1.ProfessorName= "Liu";

        Professor1.iAge=99;

        Professor1.Degree="PhD";

        Console.WriteLine("Professor Name: "+Professor1.ProfessorName);

        Console.WriteLine("Age: "+Professor1.iAge);

        Console.WriteLine("Degree: "+Professor1.Degree);

    }

}