// Calculate Pi by the Monte Carlo method

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

public class Pi extends Applet {

   Random point  = new Random();
   int i = 0;
   int n = 1000;     // set the number of random points
   int inside = 0;
   double x, y;       // Coordinates of a random point 

   public void paint (Graphics page) {
      
      i++;
      x = point.nextDouble()*2-1;    // Generate a random point
      y = point.nextDouble()*2-1;
      if (x*x + y*y <= 1) inside++; // if inside the unit circle increment counter
      
      if (i < n)
         repaint();
     else 
         page.drawString ("Pi = " + String.valueOf (4*(float)inside/n), 50, 50);
   }

}