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

public class Gcd extends Applet implements ActionListener {

   Label label1, label2, title;
   TextField input1, input2;

   int a, b, gcd;

   public void init () {
   
     title = new Label ("GCD calculator (type numbers and press Enter)");

     label1 = new Label ("First number: ");
     label2 = new Label ("Second number: ");
     input1 = new TextField (6);
     input2 = new TextField (6);

     add (title);
     add (label1);
     add (input1);
     add (label2);
     add (input2);

     input1.addActionListener(this);
     input2.addActionListener(this);

     a = 0;
     b = 0;

   }


   public void paint ( Graphics page ) {
  
     page.drawString( "GCD of " + a + " and " + b + " is " + gcd, 40, 50);
 
  }


   public void actionPerformed (ActionEvent e) {

      a = Integer.parseInt(input1.getText());
      b = Integer.parseInt(input2.getText());
      gcd = euclid(a,b);
      repaint();
   }

   public int euclid (int x, int y) {

      int t;

      while (y>0) {
         t = x % y;
         x = y;
         y = t;
      }

      return x;
  }

}