Program.cs

using exercices;
using Logique;

Console.OutputEncoding = System.Text.Encoding.UTF8;
int choix = -1;
String entree = "";

iCommand[] exercices = new iCommand[]
{
    new InteretsCumules(),
    new ExStructures2(),
    new ExMethodes2(),
    new ExEnums1()
};

do
{

    for (int i = 0; i < exercices.Length; i++)
    {
        Console.WriteLine("{0,2} {1}", i + 1, exercices[i].Name);
    }
    Console.WriteLine("{0,2} {1}", 'q', "Quitter");
    Console.WriteLine("--------------");
    Console.Write("choix : ");
    entree = Console.ReadLine();

    if (Int32.TryParse(entree, out choix))
    {
        Console.Clear();
        try
        {
            if (choix > 0 && choix <= exercices.Length)
            {
                exercices[choix - 1].Execute();
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }
        Console.ReadKey();
        Console.Clear();

    }
} while (entree != "q");