using System;

​

public class Program

{

    public static void Main()

    {

            bool ArobasPresent = false;

            bool PointPresent = false;

            int marqueArobase = 0;

            int marquePoint = 0;

            string pause;

            string eMail;

            string domaine;

            do

            {

                Console.WriteLine("Votre adresse e-mail svp ?");

                eMail = Console.ReadLine();

​

                if (eMail.Length < 8)

                    Console.WriteLine("8 caractères minimum, svp...");

                else

                {

                    ArobasPresent = false;

                    PointPresent = false;

​

                    for(int i =0; i < eMail.Length; i++)    

                    {

                        if (eMail[i] == '@')

                        {

                            ArobasPresent = true;

                            marqueArobase = i;

                        }

                    }

​

                    if (!ArobasPresent)

                        Console.WriteLine("Votre Email doit contenir un @ !");

                    else

                    {

                        for (int j = marqueArobase+1; j < eMail.Length; j++)

                        {

                            if (eMail[j] == '.')

                            {

                                PointPresent = true;

                                marquePoint = j;

                            }

                        }

                    }

​

                    if (!PointPresent)

                        Console.WriteLine("Votre Email doit contenir un . après l' @ !");

​

                }

​

            } while ((eMail.Length < 8) | (ArobasPresent == false) | (PointPresent == false));

            Console.WriteLine("Merci, votre eMail a bien été enregistré");

            domaine = eMail.Substring(marqueArobase+1, marquePoint-marqueArobase-1);

            Console.WriteLine(domaine);

            pause = Console.ReadLine();

    }

}