// Example to illustrate aggregation and nested classes

class Sphere_0 {
	
   class Center {
	int x,y;
   }
	
   Center C = new Center();
   float radiusOfCircle;

   public Sphere_0 (int xCenter, int yCenter, float radius) {	
	
	C.x=xCenter; 
	C.y=yCenter; 
	radiusOfCircle = radius;

   }
	
   public float area() {
	return (float)(4.0*Math.PI*Math.pow((double)radiusOfCircle,2.0));
   }   

}



class RoundShapeExample {
	
   public static void main(String[] args) {

	Sphere_0 s = new Sphere_0 (5,5,2.5f);

	System.out.println("Area of the sphere is " + s.area());
   }
}