IntroC#_types_variables_operators_console_if_1b

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HelloWorld1b
{
    class Program
    {
        static void Main(string[] args)
        {
            int age = 50;
            decimal money = 2.544234342342342342342342342342423M;
            char firstLetter = 'S'; // '\u0fff';
            bool isMail = true;

            int nextYear = (age + 1) * 8;

            bool result = 1 + 4 * 5 > 34 % 5 + 5 - 6 && 21321 % 4 - 6 <= 32423 % 6 + 4;

            string name = "Stoyan";
            object myObject = 5;
            Console.WriteLine("Hello World! And my age: " + age);
            Console.WriteLine("I have : " + money);
            Console.WriteLine("The first letter of my name is : " + firstLetter);
            Console.WriteLine(isMail);
            Console.WriteLine(name);
            Console.WriteLine(nextYear);
            Console.WriteLine(result);

            Console.WriteLine("Please enter your age:");
            string age1 = Console.ReadLine();
            Console.WriteLine("{1}You have entered: {0} ", age1, age);

            int ageConverted = int.Parse(age1);

            if (ageConverted < 20)
            {
                Console.WriteLine("You are an teenager");
            }
            else if (ageConverted >= 20 && ageConverted < 30)
            {
                Console.WriteLine("You are in your twentees");
            }
            else {
                Console.WriteLine("I don't know what to say");
            }

            switch (ageConverted) {
                case 10:
                case 20:
                    Console.WriteLine("perfect age");
                    break;
                case 30:
                    Console.WriteLine("Very nice");
                    break;
                default :
                    Console.WriteLine("You are not 20 or 30 years old. I don't know.");
                    break;
            }

        }
    }
}