My member function is not giving an output. Inheritance is involved. How can I fix that?

[kamilhassaan]

#include <iostream>
#include <string>
using namespace std;

class Shape
{
public:
	Shape()
	{
		ID = "";
		name = "";
		height = 0;
		width = 0;
	}

	Shape(const Shape& _S)
	{
		ID = _S.ID;
		name = _S.name;
		height = _S.height;
		width = _S.width;
	}

	void setID(string _ID)
	{
		ID = _ID;
	}

	void setName(string _Name)
	{
		name = _Name;
	}

	void setHeight(double _Height)
	{
		height = _Height;
	}

	void setWidth(double _Width)
	{
		width = _Width;
	}

	string getID()
	{
		return ID;
	}

	string getName()
	{
		return name;
	}

	double getHeight()
	{
		return height;
	}

	double getWidth()
	{
		return width;
	}

	~Shape()
	{
		cout << "Destructor is called" << endl;
	}

protected:
	string ID;
	string name;
	double height;
	double width;
};

class Rectangle : public Shape
{
public:
	double getArea()
	{
		return height * width;
	}
};

int main()
{
	Rectangle rect;
	rect.setHeight(4);
	rect.setWidth(6);
	rect.getArea();

	return 0;
}

All I'm getting is

Destructor is called

.
Instead I should be getting

24

[jlb]

Instead I should be getting

Why do you think you should be getting some output? Your program never outputs anything other than "Destructor is called" so your program looks correct to me.

[Chervil]

Try adding a cout << statement at line 90.

[JayhawkZombie]

Why should it be printing

24

?
You didn't print it anywhere.
Did you mean to do:

std::cout << rect.getArea() << std::endl;

? If you don't store the return value, it'll just be thrown away.

[AbstractionAnon]

Line 90: You call getArea(), but you ignore the returned value. As jlb pointed out, you have no cout of the area.

lines 12-13: IMO, height and width do not belong as members of Shape. They are specific to a Rectangle. Consider if you derive a Circle class from Shape. A Circle has a center point and a radius. Height and width are not appropriate.