Consider the following code. You are asked to complete the Triangle and the Rectangle class, such that the following code works as expected.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

//main.cpp #include using namespace std; class Polygon { protected: int width, height; public: Polygon (int a, int b) : width(a), height(b) {} virtual int area (void) =0; void printarea() { cout << this->area() << ' '; } }; // TO DO class Rectangle // TO DO class Triangle int main () { Polygon * ppoly1 = new Rectangle (4,5); Polygon * ppoly2 = new Triangle (4,5); ppoly1->printarea(); ppoly2->printarea(); delete ppoly1; delete ppoly2; return 0; }

Computing areas

Area of a rectangle is whwh, where ww and hh refer to the width and the height of the rectangle, respectively.

Area of a triangle is wh2wh2, where ww and hh refer to the width and the height of the triangle, respectively.