using System;

public class Program

{

    public static void Main()

    {

        Person thisIsMe = new Person("Matthias");

        thisIsMe.Birthday = new DateTime(1983, 6, 3);

        Console.WriteLine(thisIsMe.AgeInfo());

        Console.WriteLine(thisIsMe.BirthdayMonthInfo());

        Console.WriteLine(thisIsMe.charInsideName('t'));

​

        Person thisIsMyBaby = new Person("Baby");

        thisIsMyBaby.Birthday = new DateTime(2019, 6, 3);

        Console.WriteLine(thisIsMyBaby.AgeInfo());

        Console.WriteLine(thisIsMyBaby.BirthdayMonthInfo());

​

        Console.ReadLine();

    }

    public class Person

    {

        delegate string CalcAge(DateTime ReportingDate, DateTime Birthday);

​

        public Person(string NameOfPerson)

        {

            Name = NameOfPerson;

        }

​

        public DateTime Birthday;

        string Name;

​

        public string AgeInfo()

        {

            CalcAge method;

​

            if (this.Birthday > DateTime.Now)

                method = CalcAgeOfUnbornPerson;

            else

            {

                bool personUnborn = true;

                method = CalcAgeOfPerson;

            }

​

            string age = method(DateTime.Now, this.Birthday);

            return age;

        }

        public string BirthdayMonthInfo()

        {

            switch(Birthday.Month)

            {

                case 1: return "Januar";

                case 2: return "Februar";

                case 3: return "März";

                case 4: return "April";

                case 5: return "Mai";

                case 6: return "Juni";

                case 7: return "Juli";

                case 8: return "August";

                case 9: return "September";

                case 10: return "Oktober";

                case 11: return "November";

                case 12: return "Dezember";

                default: return String.Empty;

            }

​

        }

​

        private string CalcAgeOfPerson(DateTime ReportingDate, DateTime Birthday)

        {

            int age = ReportingDate.Year - Birthday.Year;

            return this.Name + " ist " + age + " Jahre alt" ;

        }

​

        private string CalcAgeOfUnbornPerson(DateTime ReportingDate, DateTime Birthday)

        {

            int age = (int)(Birthday - ReportingDate).TotalDays;

            return this.Name + " wird in " + age + " Tagen geboren";

        }

        public int charInsideName(char search)

        {

            int counter = 0;

            int found = 0;

            while (counter < Name.Length)

            {

                if (Name[counter].Equals(search))

                    found++;

​

                counter = counter + 1;

            }

​

            return found;

        }

​

        public int BirthYear

        {

            get

            {

                return Birthday.Year;

            }

            set

            {

                throw new NotSupportedException();

            }

        }

    }

}