наследование

ostream &operator<<(ostream& output, const Cylindr& c)
{
        output<<"Center = ["<<c.x<<", "<<c.y
              <<"]; Radius = "<<setiosflags(ios::showpoint)
              <<setprecision(2)<<c.radius
              <<"; Busota = "<<c.height;
        
        return output;
}

#include <iostream.h>
#include <iomanip.h>
#include "cylindr.h"
 
Cylinder::Cylinder(float h, float r, float x, float y)
    : Circle(r,x,y)
{
         height=h;
}
 
void Cylinder::setHeight(float h) {height=h;}
 
float Cylinder::getHeight() const {return height;}
 
float Cylinder::area() const
{
      return 2 * Circle::area() + 2 * 3.14159 * radius * height;
}
 
float Cylinder::volume() const
{
      return Circle::area() * height;
}
 
ostream &operator<<(ostream& output, const Cylindr& c)
{
        output<<"Center = ["<<c.x<<", "<<c.y
              <<"]; Radius = "<<setiosflags(ios::showpoint)
              <<setprecision(2)<<c.radius
              <<"; Busota = "<<c.height;
        
        return output;
}

#ifndef CYLINDR_H
#define CYLINDR_H
 
#include "circle.h"
 
class Cylinder : public Circle {
      friend ostream &operator<<(ostream &, const Cylinder &);
public:
       Cylinder(float h = 0.0, float r = 0.0,
                float x = 0.0, float y = 0.0);
       
       void setHeight(float);
       float getHeight() const;
       float area() const;
       float volume() const;
protected:
          float height;
};
 
#endif

#include <iostream.h>
#include <iomanip.h>
#include "point.h"
#include "circle.h"
#include "cylindr.h"
#include "cylindr.cpp"
 
int main()
{
    Cylinder cyl(5.7,2.5,1.2,2.3);
    
    cout<<"Koordunata X: "<<cyl.getX()<<endl
        <<"Koordunata Y: "<<cyl.getY()<<endl
        <<"Radius = "<<cyl.getRadius()<<endl
        <<"Busota = "<<cyl.getHeight()<<endl<<endl;
    
    cyl.setHeight(10);
    cyl.setRadius(4.25);
    cyl.Point(2,2);
    cout<<"New koordunatu, radius"
        <<" and vusota cylindra:"<<endl<<cyl<<endl;
    
    Point &pref=cyl;
    cout<<endl<<"Cylinder, print kak Point:"
        <<pref<<endl<<endl;
    
    Circle &cRef=cyl;
    cout<<"Cylinder, print kak Circle:"<<endl
        <<cRef<<endl<<"Plocha: "<<cRef.area()<<endl;
    system("pause>0");
    return 0;
}