//from ReadInt.java

        System.out.println("Please enter a number.");

        while(!input.hasNextInt())
        {
            System.out.println("That was not a number. Please enter a number.");
            input.nextLine(); //throw away whatever they typed. We know it is not an integer.
        }
        
        //We know the user has put in an integer
        int number = input.nextInt();
        System.out.printf("You typed: %d \n", number);