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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 Rectangle : public Line{
protected :
float height;
public:
void setHeight(float h ){height =h;};
float getHeight(){ return height;};
void showHeight(){cout<<"Heigth is "<<height; };
float rArea() { return height*length;};
virtual void showDim(){ cout<<"\nLength is "<<getLength();
cout<<"\nheight is "<<getHeight()<<"\n"; };
};

class Cube : public Rectangle{
protected :
float depth;
public :
void setDepth(float d){ depth = d;};
float getDepth(){ return depth;};
void showDepth(){ cout<<"\nDepth is "<<depth;};
float volume () { return (depth *rArea());};
virtual void showDim() { showLength();
showHeight();
showDepth();
};
};

void main(){

cout<<" Define 3 classes Line , Rectangle and Cube that inherits from each other";
Line len ;
Rectangle rec;
Cube cub;

cout<<"\n\nLine data\n";
len.setLength(1.5);
len.showDim();

cout<<"Rectangle data";
rec.setLength(1);
rec.setHeight(2);
rec.showDim();

cout<<"\nCube data\n";
cub.setLength(3);
cub.setHeight(4);
cub.setDepth(5);
cub.showDim();
}