import javax.swing.JOptionPane;
import java.text.NumberFormat;
 public class Dowhile2
 {
    public static void main(String args[])

        {
            NumberFormat formatter = NumberFormat.getNumberInstance();
            formatter.setMaximumFractionDigits(2);
            formatter.setMinimumFractionDigits(0);
            String input;
            Double one=0.0,total=0.0,ctr = 0.0;
            do{
                    input = JOptionPane.showInputDialog("Enter one");




                     if (input != null){
                        if (input.equals(""))
                            System.out.println("error");

                        else {

                            one = Double.parseDouble(input);
                            total = one + total;
                            ctr++;
                     }
                     }





                }while ( input != null);
                total = total/ctr;
                System.out.println(formatter.format(total) + " Is the avg");



        }

 }