import java.awt.*;
import java.awt.event.*;

public class Works extends TextField
{ protected int accumulator;
  protected int oldval;
  protected char pending;

  public Works()
  { super(10);
    accumulator=0;
    oldval=0;
    pending=' '; }

  public void update_display()
  { setText(""+accumulator); }

  public void digit(int n)
  { accumulator=accumulator*10+n;
    update_display(); }

  protected void do_pending()
  { switch (pending)
    { case ' ': break;
      case '+': accumulator=oldval+accumulator; break;
      case '-': accumulator=oldval-accumulator; break;
      case '*': accumulator=oldval*accumulator; break;
      case '/': accumulator=oldval/accumulator; break; }
    pending=' ';
    update_display();
    oldval=accumulator;
    accumulator=0; }

  public void plus()
  { do_pending();
    pending='+'; }

  public void minus()
  { do_pending();
    pending='-'; }

  public void times()
  { do_pending();
    pending='*'; }

  public void divide()
  { do_pending();
    pending='/'; }

  public void equals()
  { do_pending();
    accumulator=oldval; } }