EXO.java

public static int fato(int n) {

    if (n == 0) {
        return 1;
    }
    return n * fato(n - 1);

}

public static boolean Verifyentry(int nbr) {

    // read value in java

    return nbr >= 0;


}


public static boolean Continue() {
    Scanner scanner = new Scanner(System.in);
    IO.println("Voulez vous continuer ? Oui / Non");

    String response = scanner.nextLine();

    while (!response.equals("Oui") && !response.equals("Non")) {
        IO.println("Repondez par  ? Oui / Non");
        response = scanner.nextLine();
    }

    if (response.equals("Oui")) {
        return true;
    } else {
        IO.print("Terminé");
        return false;
    }

}


void main() {
    // System.out.println("hello world mum");

    Scanner scanner = new Scanner(System.in);
    IO.println("Entrez un nombre");
    int nbr_iput = scanner.nextInt();


    //verification
    while (!Verifyentry(nbr_iput)) {
        IO.print("Entrez un nombre positif");
        nbr_iput = scanner.nextInt();
    }

    IO.println("la factorielle de " + nbr_iput + "est :" + fato(nbr_iput));
    do {
        IO.print("Entrez un nombre positif");
        nbr_iput = scanner.nextInt();
        IO.println("la factorielle de " + nbr_iput + "est :" + fato(nbr_iput));

    } while (Continue());

    scanner.close();

}