static void Main(string[] args)
        {
            SuchDoge doge = new SuchDoge();
            doge.Name = "Doge";
            Person lis = new Person("Lis Larsen", new DateTime(1961, 11, 29));
            lis.AddPet(doge);

            Person per = new Person("Per Larsen", new DateTime(day: 10, month: 9, year: 1958),
                Person.Sex.Male, 1.85, 95, lis);
            lis.Weight = 60;
            lis.Height = 1.7;
            Console.WriteLine(per);
            Console.WriteLine(lis);
            lis.WalkThePets();
            lis.PetTalk();
            Console.ReadLine();
        }
 public static string Title(Person p)
 {
     string prefix;
     if (p._gender == Sex.Male)
     {
         prefix = "Mr. ";
     }
     else if (p.Married)
     {
         prefix = "Mrs. ";
     }
     else prefix = "Ms. ";
     return prefix + p._name;
 }
 public Person(string name, DateTime birthday, Sex gender, double height, double weight, Person partner)
 {
     this.Name = name;
     this.Birthday = birthday;
     this.Gender = gender;
     this.Height = height;
     this.Weight = weight;
     this.Partner = partner;
     this.Id = NEXT_ID++;
 }