public static int lireEntier(String message) {
		int i = 0;
		boolean ok;
		do {
			ok = true;
			try {
				System.out.print(message);
				clavier = new Scanner(System.in);
				i = clavier.nextInt();
			} catch (Exception e) {
				System.out.println("Mauvais format");
				ok = false;
			}
		} while (!ok);
		return i;
	}