public class Circle2
{
  private double radius = 1.0;	// instance variable or the class
  private double center_x;	// x coordinate of the center point
  private double center_y;	// y coordinate of the center point

  public Circle2()		// constructor with no parameters
  {
     center_x = 0;		// initialize member data variables
     center_y = 0;
  }
  public Circle2()
  {
	  this(1.0,0,0);
	  
  }

  public Circle2(double r, double x, double y)
  {
     radius = r;
     center_x = x;
     center_y = y;
  }

  public double getRadius()		// accessor method
  {
     return radius;
  }

  public double getCenterX()		// accessor method
  {
     return center_x;
  }

  public double getCenterY()		// accessor method
  {
     return center_y;
  }
  
  public void setRadius(double r)	// mutator method
  {
     // what possible error checking might be done here?
     radius = r;
  }

  public void setCenter(double x, double y)	// mutator method
  {
     center_x = x;
     center_y = y;
  }

  // other methods
  public double findArea()
  {  
     return (radius * radius * 3.14159);
  }

  public double findCircumference()
  {
     return (radius * 2 * 3.14159);
  }
}