USE C++

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) should be in separate files - the interface or "header" file has a .hpp extension and the implementation has a .cpp extension. As usual, all data members should be private. The Box class might be used as follows:

Box box1(2.4, 7.1, 5.0); Box box2; double volume1 = box1.calcVolume(); double surfaceArea1 = box1.calcSurfaceArea(); double volume2 = box2.calcVolume(); double surfaceArea2 = box2.calcSurfaceArea();

Your functions should have the following names:

- setHeight

- setWidth

- setLength

- calcVolume

- calcSurfaceArea

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

About using multiple files:

1. Make sure you've read and understood section 7.11.

2. Box.hpp should have "include guards" as discussed in section 7.11 (use "BOX_HPP").

3. 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.)

4. 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.

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

6. 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".