Complete the following tasks:
a. Create a base class named Rectangle that includes data members for the length and
width of a Rectangle, as well as functions to assign and display those values. Derive
a class named Block that contains an additional data member to store height, and
contains functions to assign and display the height. Write a main()function that
demonstrates the classes by instantiating and displaying the values for both a Rectangle
and a Block. Save the file as RectangleAndBlock.cpp.
b. Add a member function to the Rectangle class that computes the area of a Rectangle
(length multiplied by width). Add a member function to Block that has the same
name, but overrides the computation with a volume calculation (length by width by
height). Write a main()function that demonstrates the classes. Save the file as
RectangleAndBlock2.cpp.