class Newton  {

    static double f(double x) {
	return Math.sin(x);
    }

    static double df(double x) {
        return Math.cos(x);
    }

    public static void main(String argv[]) {

	  double tolerance = .000000001;
	  int max_count = 200;

	  double x;

	  if(argv.length==1) {
	    x= Double.valueOf(argv[0]).doubleValue();
	  } else {
            x=0;
          }
	  
          for  ( int count=1;
                 (Math.abs(f(x)) > tolerance) && ( count<max_count);
                 count ++)  {
            x=x- f(x)/df(x);
	    System.out.println("Step: "+count+" x:"+x+" Value:"+f(x));
	  }            

	  if( Math.abs(f(x)) <= tolerance) {
	   System.out.println("Zero found at x="+x);
	  }
	  else {
	   System.out.println("Failed to find a zero");
	  }
     }
}