All Notes on BCA

#include<iostream.h>
class Shape
{
protected:
 float width, height;
public:
 void set_data (float a, float b)
 {
  width = a;
  height = b;
 }
};

class Rectangle: public Shape
{
public:
 float area ()
 {
  return (width * height);
 }
};

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 << rect.area() << endl;
 cout << tri.area() << endl;
 return 0;
}