Implement a base class Geo and derived from this class Rect a constraint such as any derived classes from Geo must have method to calculate the area.Derive from Rect class Sqr its const take one value?

Answer 1

This is not a question, it is an assignment.

class Geo {

public:

virtual double area (void) const = 0;

virtual ~Geo (void) {}

// ...

};

class Rect : public Geo {

private:

double m_width;

double m_height;

public:

Rect (double width, double height): m_width (width), m_height (height) {}

double area (void) const override { return m_width * m_height; }

~Rect (void) override {};

// ...

};

class Sqr : public Rect {

public:

Sqr (double width): Rect {width, width} {}

~Sqr (void) override {}

// ...

};