package pi;

public class Pi {

  /** Creates and starts a new Pi application. */
  public Pi () {
    for (long trialsCount = 10; trialsCount <= 1000000000L; trialsCount *= 10) {
      int successes = 0;
      for (int i = 0; i < trialsCount; i++) {
        double x = Math.random ();
        double y = Math.random ();
        if (x * x + y * y < 1.0) {successes++;}
      }
      double pi = 4.0 * successes / trialsCount;
      System.out.println ("in " + trialsCount + " trials pi=" + pi 
          + "; difference=" + (Math.PI - pi));
    }
  }

  public static void main (String [] arguments) {
    new Pi ();
  }
}