Write a class called Box that has three double fields called height, width and length. The class should have set methods for each field. It should have a three-parameter constructor that takes three doubles and passes them to the set methods to initialize the fields of the Box. It should have a default constructor that uses the set methods to initialize each field to 1. It should have a method that calculates and returns the volume of the Box and a method that calculates and returns the surface area of the Box. The class declaration (interface) and the function definitions (implementation) must be in separate files - the interface or "header" file has a .hpp extension and the implementation has a .cpp extension. All data members should be private.

Your functions should have the following names:

setHeight

setWidth

setLength

getVolume

getSurfaceArea

The files must be named: Box.hpp and Box.cpp

About using multiple files:

-Box.hpp should have "include guards" as discussed on page 447 (use "BOX_HPP").

-Box.cpp needs to #include Box.hpp. When you include your own .hpp files (header files), put double quotes around them instead of angled brackets. (You should only #include .hpp files, not .cpp files.)

-When testing your program with your own main method, put it in a separate file (this is the "client" code) and give it a name with a .cpp extension.

-Your main method also needs to #include Box.hpp.

-If you named the file with your main method "boxMain.cpp", then you can compile your program with "g++ Box.cpp boxMain.cpp -o box".