import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.applet.Applet;
import java.util.*;

class Kalk extends Applet implements ActionListener
{
 TextField tf1=new TextField("");
 Button b11=new Button("0");
 Button b12=new Button("1");
 Button b13=new Button("2");
 Button b14=new Button("3");
 Button b15=new Button("4");
 Button b21=new Button("5");
 Button b22=new Button("6");
 Button b23=new Button("7");
 Button b24=new Button("8");
 Button b25=new Button("9");
 Button b31=new Button("+");
 Button b32=new Button("-");
 Button b33=new Button("*");
 Button b34=new Button("/");
 Button b35=new Button("=");

 String tehe="";
 int esimeneArv, teineArv;
 int vastus;
 double jvastus;
 char op;

  Kalk(){
   Panel p1=new Panel(new GridLayout(3,5));
/*
   for(int i=11;i<36;i++){
	p1.add(b + i);
   }
*/
   p1.add(b11);
   p1.add(b12);
   p1.add(b13);
   p1.add(b14);
   p1.add(b15);
   p1.add(b21);
   p1.add(b22);
   p1.add(b23);
   p1.add(b24);
   p1.add(b25);
   p1.add(b31);
   p1.add(b32);
   p1.add(b33);
   p1.add(b34);
   p1.add(b35);

   setLayout(new BorderLayout());

   add(tf1,BorderLayout.NORTH);
   add(p1, BorderLayout.CENTER);

   b11.addActionListener(this);
   b12.addActionListener(this);
   b13.addActionListener(this);
   b14.addActionListener(this);
   b15.addActionListener(this);
   b21.addActionListener(this);
   b22.addActionListener(this);
   b23.addActionListener(this);
   b24.addActionListener(this);
   b25.addActionListener(this);
   b31.addActionListener(this);
   b32.addActionListener(this);
   b33.addActionListener(this);
   b34.addActionListener(this);
   b35.addActionListener(this);

  } // end Kalk()

public void actionPerformed(ActionEvent e){
    if(e.getSource()==b11){
	tehe=tehe+"0";		
    }
    if(e.getSource()==b12){
	tehe=tehe+"1";		
    }
    if(e.getSource()==b13){
	tehe=tehe+"2";		
    }
    if(e.getSource()==b14){
	tehe=tehe+"3";		
    }
    if(e.getSource()==b15){
	tehe=tehe+"4";		
    }
    if(e.getSource()==b21){
	tehe=tehe+"5";		
    }
    if(e.getSource()==b22){
	tehe=tehe+"6";		
    }
    if(e.getSource()==b23){
	tehe=tehe+"7";		
    }
    if(e.getSource()==b24){
	tehe=tehe+"8";
    }
    if(e.getSource()==b25){
	tehe=tehe+"9";
    }

    if(e.getSource()==b31){
	esimeneArv=Integer.parseInt(tehe);
	tf1.setText("" + esimeneArv);
	tehe="";
	op='+';
    }
    if(e.getSource()==b32){
	esimeneArv=Integer.parseInt(tehe);
	tf1.setText("" + esimeneArv);
	tehe="";
	op='-';
    }
    if(e.getSource()==b33){
	esimeneArv=Integer.parseInt(tehe);
	tf1.setText("" + esimeneArv);
	tehe="";
	op='*';
    }
    if(e.getSource()==b34){
	esimeneArv=Integer.parseInt(tehe);
	tf1.setText("" + esimeneArv);
	tehe="";
	op='/';
    }

    if(e.getSource()==b35){
	teineArv=Integer.parseInt(tehe);
	tf1.setText("" + teineArv);
	tehe="";
	switch(op){
	 case '+':
		vastus = esimeneArv + teineArv;
		tf1.setText(""+vastus);
		break;
         case '-':
		vastus = esimeneArv - teineArv;
		tf1.setText(""+vastus);
		break;
         case '*':
		vastus = esimeneArv * teineArv;
		tf1.setText(""+vastus);
		break;
         case '/':
		jvastus = (double)esimeneArv / teineArv;
		String kontr="" + jvastus;
		//tf1.setText(kontr);
System.out.println(esimeneArv+" "+teineArv+" "+kontr+" "+kontr.length());
    		if(kontr.substring(kontr.length()-1).equals("0")){
			vastus=(int)jvastus;
			tf1.setText("" + vastus);
			kontr="";
                } else {
		        tf1.setText(""+jvastus);
			kontr="";
		}
		break;
	} // end switch
    }
} // end actionPerformed()

public static void main(String argumendid[])
{
    Frame f=new Frame("KALKULAATOR");
    f.setSize(200, 140);
    f.add(new Kalk());
    f.setVisible(true);
	
    f.addWindowListener(
      new WindowAdapter(){
        public void windowClosing(WindowEvent e){
          System.exit(0);
			}		
	}	
	 ); 
} // end of public static void main
} // end class Kalk