2. in this problem we will be overloading some operators for the rectangularcube class we defined in assignment 1. recall, define the class rectangularcube. a rectangularcube has three sides length(l), width (w), and height (h), define the sides as private data fields. include a no-argument constructor that sets all three sides to 1. the class must also have a constructor with parameters that receive parameters to initialize sides of the rectangularcube. include get and set functions for all three data fields. finally define the functions volume () and surfacearea () in the class rectangularcube that use the formulas given below to calculate and return the volume and the surface area of the rectangularcube. (a) overload the output operator "< < " as a nonmember function in the rectangularcube class to print its length, width, height, volume and surface area. describe the purpose of a friend function, would you make the operator< < function a friend of the class