double getradius(; double getheight0; double volumed; double surface area 0; private: double radius: double height; Cylinder: Cylinder( radius=5.0 height=10.0 例82(圆柱体类构造函数带有参数的情形 class cylinder public: Cylinder(doubler, double h); void setcylinder(double r, double h);double getradius(); double getheight(); double volume(); double surface_area(); private: double radius; double height； }; Cylinder::Cylinder( ) { radius=5.0; height=10.0; } class Cylinder { public: Cylinder(double r,double h); void setcylinder(double r,double h); 例 8-2 圆柱体类构造函数带有参数的情形