import java.applet.Applet;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class Tekst2 extends Applet implements ActionListener{
  TextField pikkus=new TextField(" 100 ");
  TextField vastus=new TextField(10);
  Label l1=new Label("vastus:");
  Button nupp=new Button("  OK  ");
  int nr=100;
  public void init(){
    setBackground(Color.white);
    add(pikkus);
    add(nupp);
   add(l1);
   add(vastus);
    nupp.addActionListener(this);
 pikkus.addActionListener(this);
  }
  
  public void actionPerformed(ActionEvent e){
    nr=Integer.parseInt(pikkus.getText().trim());
    
    repaint();
    vastus.setText(Math.round(((Math.pow(nr/2, 2)*3.14)/100))+" ruutu");
   }

  public void paint(Graphics g){
              for(int i=0; i<500; i=i+10){
    g.setColor(new Color(200, 200, 200));
    g.drawLine( i, 25, i, 300);
   for(int j=25; j<500; j=j+10){
	 g.setColor(new Color(200, 200, 200));
   	g.drawLine( 0, j, 300, j);
		g.setColor(Color.black);
 	   g.drawOval(10, 50, nr, nr);


}
 }
}
}