Write a C$++$ program that will implement the following tasks to help students understand how to use friend functions. Make sure to use appropriate variable types and display the results clearly. Can you break down the code in $.$h and $.$cpp files with explanation? Thank you in advance!

Class Definition:

Define a class named "Rectangle" with the following private members:

length $($double$)$: to store the length of the rectangle.

width $($double$)$: to store the width of the rectangle.

Declare a constructor for the "Rectangle" class that takes parameters to initialize the length and width.

Declare a friend function named "calculateArea" that takes a constant reference to a "Rectangle" object as a parameter.

Inside the "calculateArea" function, calculate and return the area of the rectangle using the length and width members of the object.

Object Creation:

Inside the main function, create an object of the "Rectangle" class.

Prompt the user to enter values for the length and width of the rectangle.

Use the provided input to initialize the object's members.

Display the details of the rectangle object.

Call the "calculateArea" function and pass the rectangle object as an argument.

Display the calculated area of the rectangle.

Friend Function Implementation:

Implement the "calculateArea" friend function outside the class definition.

The friend function should have access to the private members of the "Rectangle" class.

Calculate and return the area of the rectangle using the length and width members of the object passed as a parameter.

Additional Functionality:

Declare a friend function named "compareRectangles" that takes two constant references to "Rectangle" objects as parameters.

Inside the "compareRectangles" function, compare the areas of the two rectangles.

Display a suitable message indicating which rectangle has a larger area or if both rectangles have the same area.

Call the "compareRectangles" function from the main function and pass two rectangle objects as arguments.