public class Circle
{
  private double radius = 1.0;	// instance variable of the class

  // methods
  public Circle()		// default constructor
  {
  }

  public Circle(double r)	// constructor with parameter
  {
     setRadius(r);
  }

  public void setRadius(double r)
  {
     if (r <= 0)
	return;			// error check

     radius = r;		// set the member data
  }

  public double getRadius()
  {
     return radius;
  }

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

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