public static void Main(string[] args)
float trg_100 = trg * 100.0f;
Console.WriteLine("le trg est de " + trg_100);
Console.WriteLine ("le trg est de " + trg_100 + " %");
Console.WriteLine ("le trg est de {0} %", (trg * 100.0f));
Console.WriteLine("le trg est de {trg_100} %");