EXAMPLE OF INHERITENCE

 #include<iostream>

using namespace std;

class Rectangle

{

private:

 int length;

 int breadth;

public:

 Rectangle();

 Rectangle(int l,int b);

 Rectangle(Rectangle &r);

 int getLength(){return length;}

 int getBreadth(){return breadth;}

 void setLength(int l);

 void setBreadth(int b);

 int area();

 int perimeter();

 bool isSquare();

 ~Rectangle();

};

class Cuboid:public Rectangle

{

private:

 int height;

public:

 Cuboid(int h)

 {

 height=h;

 }

 int getHeight(){return height;}

 void setHeight(int h){height=h;}

 int volume(){return getLength()*getBreadth()*height;}

};

int main()

{

 Cuboid c(5);

 c.setLength(10);

 c.setBreadth(7);

 cout<<"Volume is "<<c.volume()<<endl;

}

Rectangle::Rectangle()

{

 length=1;

 breadth=1;

}

Rectangle::Rectangle(int l,int b)

{

 length=l;

 breadth=b;

}

Rectangle::Rectangle(Rectangle &r)

{

 length=r.length;

 breadth=r.breadth;

}

void Rectangle::setLength(int l)

{

 length=l;

}

void Rectangle::setBreadth(int b)

{

 breadth=b;

}

int Rectangle::area()

{

 return length*breadth;

}

int Rectangle::perimeter()

{

 return 2*(length+breadth);

}

bool Rectangle::isSquare()

{

 return length==breadth;

}

Rectangle::~Rectangle()

{

 // cout<<"Rectangle Destroyed";

}