JavaFactorielInput

import java.util.Scanner;

public class Factoriel {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        // communicate with the user View logical layer
        // Start of the View
        int n = 10;
        Scanner input = new Scanner(System.in);

        System.out.print("I will calculate n!. Please, enter n: ");

        while(!input.hasNextInt()){
            String error = input.next();
            System.out.printf("%s is not a number\n", error);

        }
        n = input.nextInt();
        input.close();
        // End of the view


        // the business logic (Controller) logical layer
        int factoriel = 1;
        for(int i = 0; i <= n; i++) {
            if(i == 0 || i == 1) factoriel = 1;
            else factoriel *= i;
            // TODO this should be moved to the view
            System.out.println("Factoriel " + i + "! = " + factoriel);
        }
    }

}