第十周任务（3）

#include <iostream>using namespace std;class Point {public:Point(double a,double b):x(a),y(b){}void setPoint(double a,double b);double getX(){return x;}double getY(){return y;}protected:double x;double y; };class Circle:public Point{public:Circle(double a,double b,double c):Point(a,b),r(c){}void setR(double);double getR(){ return r;}double area(){ return (3.14*r*r);}/*friend ostream &operator <<(ostream &,Ciecle &);*/protected:double r;};class Cylinder:public Circle{public:Cylinder(double a,double b,double c,double d):Circle(a,b,c),h(d){}void setH(double);double getH(){return h;}double s();double v();friend ostream &operator <<(ostream &,Cylinder &);protected:double h;};void Circle::setR(double c){r=c;}void Point::setPoint(double a,double b){x=a;y=b;} /*ostream &operator <<(ostream &output,Ciecle &c) { output<<"Center=["<<c.x<<","<<c.y<<"],r="<<c.r<<",area"<<c.area()<<endl; return output; }*/ void  Cylinder::setH(double d) { h=d; }double Cylinder::s(){return (2*area()+3.14*2*r*h);}double Cylinder::v(){return (area()*h);}ostream &operator <<(ostream &output,Cylinder &c){output<<"Center=["<<c.x<<","<<c.y<<"],r="<<c.r<<",h"<<c.h<<",area"<<c.s()<<",volume="<<c.v()<<endl;return output;}int main( )  {      Cylinder c1(3.5,6.4,5.2,10);      cout<<"\noriginal cylinder:\nx="<<c1.getX( )<<", y="<<c1.getY( )<<", r="          <<c1.getR( )<<", h="<<c1.getH( )<<"\narea="<<c1.s()          <<",volume="<<c1.v()<<endl;      c1.setH(15);           c1.setR(7.5);            c1.setPoint(5,5);             cout<<"\nnew cylinder:\n"<<c1;              system("pause");      return 0;  }