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In the program in Segment 155, you saw the volume
function defined as follows for box_car objects:
double volume (box_car b) {
return b.height * b.width * b.length;
}
You can define volume to be even more specific to box_car
objects by moving its definition into the definition of the box_car
class. Such functions, like member variables, are said to be member
functions of the classes in which they are defined.