using System;

public class Person {

  //enumeration
  public enum Sex {MALE, FEMALE};

  // private instance fields
  private String   _firstName;
  private String   _middleName;
  private String   _lastName;
  private Sex      _gender;       
  private DateTime _birthday;

  
  //private default constructor
  private Person(){}

  public Person(String firstName, String middleName, String lastName, 
                Sex gender, DateTime birthday){
     FirstName = firstName;
     MiddleName = middleName;
     LastName = lastName;
     Gender = gender;
     BirthDay = birthday;
  }



  // public properties
  public String FirstName {
    get { return _firstName; }
    set { _firstName = value; }
  }
  
  public String MiddleName {
    get { return _middleName; }
    set { _middleName = value; }
  }
  
  public String LastName {
    get { return _lastName; }
    set { _lastName = value; }
  }
  
  public Sex Gender {
    get { return _gender; }
    set { _gender = value; }
  }
  
  public DateTime BirthDay {
    get { return _birthday; }
    set { _birthday = value; }
  }
  
  public int Age {
    get {
      DateTime today = DateTime.Now;
      return today.Year - _birthday.Year;
    }
  }
  
  public String FullName {
    get { return FirstName + " " + MiddleName + " " + LastName; }
  }
  
  public String FullNameAndAge {
    get { return FullName + " " + Age; } 
  }
  
  public override String ToString(){
    return FullName + " is a " + Gender + " who is " + Age + " years old.";
  }

} // end Person class