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Another virtue of procedure abstraction is that you easily
can improve how a computation is done. You might decide, for
example, that it is wasteful for your box_car_volume function
to multiply out height, width, and length twice. Accordingly, you
might decide to do the computation just once, using a variable,
named result, to hold on to the value:
double box_car_volume (double h, double w, double l) {
double result = h * w * l;
cout << "The volume is " result << endl;
return result;
}
Again, you do not need to bother to find all the places where the volume is
computed using the box_car_volume function; you need only to change
the box_car_volume function's definition.