using System;

//Professor Class

public class Professor

{

    //[Code] Define Fields

    public string ProfessorName;

    private int _Age;

    private string _Degree;

​

    //[Code] Define Property Age

    //Make sure Age is between 18 and 70

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

    public int Age

    {

        get

        {

            return _Age;

        }

        set

        {

            if(value < 18 || value > 70) _Age = 30;

            else _Age = value;

        }

    }

    public string Degree

    {

        get

        {

            return _Degree;

        }

        set

        {

            if(value.Length < 3) _Degree = "Master";

            else _Degree = value;

        }

    }

    //[Code] Define Property Degree

    //Make sure Degree has at least three letters

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

​

    //[Code] Constructor

    public Professor()

    {

    }

}

​

public class Program

{

    public static void Main()

    {

        Professor Liu = new Professor();

        Liu.ProfessorName = "Liu";

        Liu.Age = 99;

        Liu.Degree = "PhD";

        //[Code] Create object ProfessorLiu

        // ProfessorName: Liu

        // Age: 99

        // Degree: PhD

​

    }

}