Console.WriteLine($"Your initials are {first[0]}.{last[0]}");
        }
        static void ac24()
        {
            Console.Clear();

            Console.Write("Enter your year of birth: ");
            int YearOfBirth = int.Parse(Console.ReadLine());
            Console.Write("Enter the current year: ");
            int Year = int.Parse(Console.ReadLine());

            Console.WriteLine($"You are {Year-YearOfBirth} years old");
        }
    }
}

            Console.WriteLine($"Your initials are {first[0]}.{last[0]}");
        }
        static void ac24()
        {
            Console.Clear();

            Console.Write("Enter your year of birth: ");
            int YearOfBirth = int.Parse(Console.ReadLine());
            Console.Write("Enter the current year: ");
            int Year = int.Parse(Console.ReadLine());

            Console.WriteLine($"You are {Year-YearOfBirth} years old");
        }
    }
}

namespace AC_in_C_
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter the project: ");
            string selector = Console.ReadLine();

            switch (selector)
            {
                case "11":
                    ac11();
                    break;

                case "21":
                    ac21();
                    break;

                case "22":
                    ac22();
                    break;

                case "23":
                    ac23();
                    break;

                case "24":
                    ac24();
                    break;

                default:
                    Console.WriteLine("That is not a project you dumb shit");
                    break;
            }

        }
        static void ac11()
        {
            Console.Clear();
            Console.WriteLine("Hello, World");
        }
        static void ac21()
        {
            Console.Clear();

            string name = "Zilly";
            string colour = "red";

            Console.WriteLine($"My name is {name}");
            Console.WriteLine($"My favourite colour is {colour}");
        }
        static void ac22()
        {
            Console.Clear();

            Console.Write("Enter a noun: ");
            string noun = Console.ReadLine();
            Console.Write("Enter a verb: ");
            string verb = Console.ReadLine();
            Console.Write("Enter an adjective: ");
            string adjective = Console.ReadLine();

            Console.WriteLine($"Here's the story:\nThe {adjective} {noun} likes to {verb} in the park");
        }
        static void ac23()
        {
            Console.Clear();

            Console.Write("Enter your first name: ");
            string first = Console.ReadLine();
            Console.Write("Enter your last name: ");
            string last = Console.ReadLine();

namespace AC_in_C_
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter the project: ");
            string selector = Console.ReadLine();

            switch (selector)
            {
                case "11":
                    ac11();
                    break;

                case "21":
                    ac21();
                    break;

                case "22":
                    ac22();
                    break;

                case "23":
                    ac23();
                    break;

                case "24":
                    ac24();
                    break;

                default:
                    Console.WriteLine("That is not a project you dumb shit");
                    break;
            }

        }
        static void ac11()
        {
            Console.Clear();
            Console.WriteLine("Hello, World");
        }
        static void ac21()
        {
            Console.Clear();

            string name = "Zilly";
            string colour = "red";

            Console.WriteLine($"My name is {name}");
            Console.WriteLine($"My favourite colour is {colour}");
        }
        static void ac22()
        {
            Console.Clear();

            Console.Write("Enter a noun: ");
            string noun = Console.ReadLine();
            Console.Write("Enter a verb: ");
            string verb = Console.ReadLine();
            Console.Write("Enter an adjective: ");
            string adjective = Console.ReadLine();

            Console.WriteLine($"Here's the story:\nThe {adjective} {noun} likes to {verb} in the park");
        }
        static void ac23()
        {
            Console.Clear();

            Console.Write("Enter your first name: ");
            string first = Console.ReadLine();
            Console.Write("Enter your last name: ");
            string last = Console.ReadLine();

string hello = "198248"
string digits = "1234567890"

if (hello in digits)
{
  return true
}

string hello = "198248"
string digits = "1234567890"

if (hello in digits)
{
  return true
}