using System;

//Professor Class

public class Professor

{

    //[Code] Define Fields

    public string strProfessorName;

    private int _age;

    public int Age 

    {

    //[Code] Define Property Age

    //Make sure Age is between 18 and 70

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

        get 

        {

            return _age;

        }

        set

        {

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

            _age = value;

        else

        _age = 30;

        }

    }

​

    //[Code] Define Property Degree

    private string _degree;

    public string Degree

    //Make sure Degree has at least three letters

    //If Degree violates the rule, set the defaul value as "Master"

    {

        get

        { 

            return _degree;

        }

        set

        {

            if 

            (value.Length >= 3)

                _degree = value;

            else 

                _degree = "Master";

        }

    }

    //[Code] Constructor

    public Professor()

    {

    }

}

public class Program

{

    public static void Main()

    {

        //[Code] Create object ProfessorLiu

        Professor Professor1 = new Professor();

        // ProfessorName: Liu

        Professor1.strProfessorName = "Liu";

        // Age: 99

        Professor1.Age = 99;

        // Degree: PhD

        Professor1.Degree = "PhD";

​

}}