/**

* @(#)tong.java

*

*

* @author

* @version 1.00 2009/10/16

*/

import javax.swing.JOptionPane;

public class tong {

public static void main(String args[]) {

double a;

int luachon;

double s=0;

do{

a=Double.parseDouble(JOptionPane.showInputDialog("nhap a : "));

luachon=JOptionPane.showConfirmDialog(null,"nhap tiep : ");

s+=a;

}while(luachon==JOptionPane.OK_OPTION);

JOptionPane.showMessageDialog(null,"tong :"+ s);

}

}