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Instead of handing three double-type arguments to box_car_volume,
you can write a new function, volume, that takes just one argument,
which you declare to be a box_car object. If you choose this
approach, you need to change the body: instead of height,
width, and length parameters, the body must refer to the
box_car object's height, width, and length
member variables:
double volume (box_car b) {return b.height * b.width * b.length;}