double length;double width;double a;double b;double c;System.out.println("请输入圆形半径：");Scanner sc = new Scanner(System.in);r = sc.nextDouble();double circleCircumference = circle.getCircleCircumference(...

定义一个圆类circle作为基类

{ radius=r;} double Circle::getr(){ return radius;} double Circle::Area(){ return P*radius*radius;} class Cylinder:public Circle { public :Cylinder(double h1);double R(double r);double Area();void A...