package shape;
class CircleTest
{
  public static void main(String [] args)
  {
  	CircleI  c1=new CircleI();
  	c1.radius=5.0;
  	System.out.print("半徑為"+c1.radius+"的圓的面積："+c1.getArea());
  	System.out.println("  周長："+c1.getGirth());
  }
}