// Pi.java : calculate the value of PI

import java.util.Random;

class Pi
{
  final static int nDefMax = 500;
  final static int nDefInterval = 50;

  // main
  public static void main(String args[])
  {
    int nMax;
    int nInterval;

    // set the number of point
    if (args.length >= 1)
      nMax = SetLimit(args[0]);
    else
      nMax = nDefMax;

    // set the number of interval
    if (args.length >= 2)
      nInterval = SetInterval(args[1]);
    else
      nInterval = nDefInterval;

    // Calculate PI
    CalcPI(nMax, nInterval);
  }

  // SetLimit : Set the number of point
  static int SetLimit(String str)
  {
    int n;
    n = Integer.valueOf(str).intValue();
    if (n <= 0)
      return nDefMax;
    else
      return n;
  }

  // SetInterval : Set the number of interval
  static int SetInterval(String str)
  {
    int n;
    n = Integer.valueOf(str).intValue();
    if (n <= 0)
      return nDefInterval;
    else
      return n;
  }

  // CalcPI : Calculate PI
  static void CalcPI(int nMax, int nInterval)
  {
    int nCount;
    float x;
    float y;
    int nInside;
    Random rand;

    nInside = 0;
    rand = new Random();

    for (nCount = 1; nCount <= nMax; nCount++)
    {
      x = rand.nextFloat();
      y = rand.nextFloat();

      // Is the point in the circle ?
      if (IsInside(x, y) == Boolean.TRUE)
        nInside++;

      if ((nCount % nInterval == 0) || (nCount >= nMax))
        PrintPI(nCount, nInside);
    }
  }

  // IsInside : Check the point is in the circle
  static Boolean IsInside(float x, float y)
  {
    if ( ((x * x) + (y * y)) <= 1 )
      return Boolean.TRUE;
    else
      return Boolean.FALSE;
  }

  // PrintPI : Print the value of PI
  static void PrintPI(int nTotal, int nInside)
  {
    float fPi;

    fPi = (float) nInside / nTotal * 4;
    System.out.println(nTotal + " Points : PI = " + fPi);
  }
}