// Illustrate use of a while-loop to read an arbitrary
        // number of values interactively from the user.
        // The end of the input is indicated when the value -1 is read.
class BarChartMain2 {
    public static void main(String[] args){
        SimpleInput reader = new SimpleInput();
        // Use a minder to check sensible use of the BarChart.
        // The chart displays values in the range [1..100]
        BarChartMinder minder = new BarChartMinder(new BarChart());

        // The value on which to stop.
        int terminatingValue = -1;
        System.out.println("Please input the values, use "+
                           terminatingValue+" to finish.");
        int value = reader.nextInt();
        while(value != terminatingValue){
            minder.addToChart(value);
            value = reader.nextInt();
        }
    }
}