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#include<iostream.h>

class Line {
protected :
float length;
public :
void setLength(float len) { length=len;};
float getLength () {return length;};
void showLength(){ cout<<"length is "<<length<<"\n";};
virtual void showDim (){ cout<<"Length is "<<getLength()<<"\n\n";};
};

class Circle {
protected :
float radius;
public:
void setRadius(float r){ radius=r;};
float getRadius(){return radius;};
void showRadius(){cout<<radius;};
float circleArea(){ return (2*3.14*radius*radius) ; };
};

class Cylinder : public Line ,public Circle{
public :
float volume() { return (circleArea() * length) ;};
};

void main(){

cout<<"\n Defines 3 classes Line ,Circle and Cylinder \n, Cylinder inherits from both classes";
Cylinder clndr;
clndr.setLength(2);
clndr.setRadius(3);
cout << "\n\n The cylinder volume is "<<clndr.volume();
}