Hierarchical Inheritance Example.

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#include<iostream>

using namespace std;

class Shape

{

protected:

 float width, height;

public:

 void set_data (float a, float b)

 {

  width = a;

  height = b;

 }

};

//inheriting Shape class

class Rectangle: public Shape

{

public:

 float area ()

 {

  return (width * height);

 }

};

//inheriting Shape class

class Triangle: public Shape

{

    public:

        float area ()

        {

            return (width * height / 2);

        }

};

int main ()

{

 Rectangle rect;

 Triangle tri;

 rect.set_data (5,3);

 tri.set_data (2,5);

 cout <<"Area of Rectangle : " <<rect.area() << endl;

 cout <<"Area of Triangle : "<< tri.area() << endl;

 return 0;

}