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

public class detddbd extends java.applet.Applet implements ActionListener
{
  
  public final int MAXTIME = 50;
  public final int PRNTTIME = 1;

  private double alpha, k, beta;

  public void init()
    /*  first method run by the applet, always. */
    /*  adds applet components to the frame, begins running of the */ 
    /*  simulation */
    {
      setBackground(Color.white);
      setForeground(Color.black);
      display = new TextArea("",30,60,TextArea.SCROLLBARS_VERTICAL_ONLY);
      run = new Button("run");
      add(display);
      add(run);
      run.addActionListener(this);
    }
  
  public void actionPerformed(ActionEvent event)
    /*  method performed when a button is pressed or another */
    /*  action is performed */
    {
      Object cause = event.getSource();
      if (cause == run)
	{
	  run.setEnabled(false);
	  RunSim();
	  run.setEnabled(true);
	}
    }

  public void RunSim()
    {
      display.setText("");
      double n1,n2,n3,n4,n5;
      alpha = 0.2;
      beta = 0.1;
      k = 40.0;
      
      for(int ttt=0;ttt<MAXTIME;ttt+=PRNTTIME)
	{
	  n1 = growth( 5.0,(double)ttt);
	  n2 = growth(10.0,(double)ttt);
	  n3 = growth(20.0,(double)ttt);
	  n4 = growth(30.0,(double)ttt);
	  n5 = growth(40.0,(double)ttt);
	  
	  
	  display.append(" " + ttt + " ");
	  NumFix.Output(display,new double[] {n1,n2,n3,
						n4,n5},6,0);
	  display.append("\n");
	}
    }
  
  public double growth(double n0, double time)
    {
      return (n0*k*(alpha-beta)/(alpha*n0+(k*(alpha-beta)-alpha*n0)
				 *Math.exp(-(alpha-beta)*time)));
    }

  private TextArea display;
  private Button run;
}