// Calculate Pi by the Monte Carlo method. Draws the random point area

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

public class Pi1 extends Applet {

   Random point  = new Random();
   int i = 0;
   int n = 10000;     // set the number of random points
   int inside = 0;
   double x, y;       // Coordinates of a random point 

   public void paint (Graphics page) {
      
     do {
        i++;
        x = point.nextDouble()*2-1;    // Generate a random point
        y = point.nextDouble()*2-1;
        page.fillRect ((int)(x*100)+150, (int)(y*100)+150, 1, 1);
        if (x*x + y*y <= 1) inside++; // if inside the unit circle increment counter
      
      } while (i < n);
      page.drawString ("Pi = " + String.valueOf (4*(float)inside/n), 50, 270);
   }

}