Implement a base class Rectangle with length and width as private members (use d

Question

Implement a base class Rectangle with length and width as private members (use double). Write a constructor and write an utility method getArea() and get methods getLength() and getWidth() as well.

Implement a derived class Square with constructor that accepts just one value (side?) and invoke base class Rectangle's constructor appropriately. Write a method getSide() which will return the length of one side. Write your code in one source file.

Here is the UML diagram for both classes:

Rectangle:

-length : double

-width : double

+Rectangle(double, double)

+getLength() : double

+getWidth() : double

+getArea() : double

Square:

+Square(double)

+getSide() : double

Explanation / Answer

>   class Rectangle{
>       double length;
>       double width;
>  
>   public:
>          
>       Rectangle(double l, double w);
>       double getLength();
>       double getWidth();
>       double getArea();
>  
>   };
>  
>   class Square : public Rectangle{
>  
>   public:
>       Square(double side);
>       double getSide();
>   };
>  
>   Rectangle::Rectangle(double l, double w){
>       length = l;
>       width = w;
>   }
>  
>   double Rectangle::getLength(){
>       return length;
>   }
>  
>   double Rectangle::getWidth(){
>       return width;
>   }
>  
>   double Rectangle::getArea(){
>       return length*width;
>   }
>  
>   Square::Square(double side) : Rectangle(side, side){
>   }
>  
>   double Square::getSide(){
>       return getLength();
>   }

Code in Action : http://ideone.com/Ip4K5H

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