C++ This is a debugging question. So can someone please explain what is wrong with this code if any and how can that be fixed. explain in details.

#include

# include

using namespace std;

class shape {

protected:

int width, height;

public:

shape(int a = 0, int b = 0){

width = a;

height = b;

}

};

class rectangle : public shape{

public:

rectangle(int a = 0, int b = 0) : shape(a, b){}

int area(){

cout << "rectangle class area is: " << endl;

return (width * height);

}

};

class triangle : public shape{

public:

triangle(int a = 0, int b = 0) : shape(a, b){}

int area(){

cout << "Triangle are is: " << endl;

return (width * height / 2);

}

};

int main(){

shape *Sh;

triangle tri(10, 5);

rectangle rec(10, 7);

Sh = &tri;

Sh->area();

Sh = &rec;

Sh->area();

rec.area();

system("pause");

}