using System;

public class Professor{

    public string ProfessorName;

    private int iAge;

    private string strDegree;

​

    public int Age{

        get{

            return iAge;

        }

        set{

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

                iAge=value;

            }

            else{

                iAge=30;

            }

        }

    }

    public string Degree{

        get{

            return strDegree;

        }

        set{

            if(value.Length>=3){

                strDegree = value;

            }

            else{

                strDegree = "Master";

            }

        }

    }

    public Professor(){

    }

}

​

public class Program

{

    public static void Main()

    {

    Professor Prof1 = new Professor();

    Prof1.ProfessorName = "Liu";

    Prof1.Age = 99;

    Prof1.Degree = "PhD";

    Console.WriteLine("ProfessorName: {0}; Age: {1}; Degree: {2}", Prof1.ProfessorName, Prof1.Age, Prof1.Degree);

    Console.WriteLine("");

    Professor Prof2 = new Professor();

    Prof2.ProfessorName = "James";

    Prof2.Age = 35;

    Prof2.Degree = "MD";

    Console.WriteLine("ProfessorName: {0}; Age: {1}; Degree: {2}", Prof2.ProfessorName, Prof2.Age, Prof2.Degree);

    }

}