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Another virtue of function abstraction is that you can
improve more
easily how a computation is done. You might decide, for example, that it
is wasteful for your doubling_time function to divide 72.0 by
the rate twice. Accordingly you might decide to do the division just once,
using a variable, named result, to hold on to the value:
double doubling_time (double r) {
double result = 72.0 / r;
printf ("The doubling time for rate %f is approximately %f years.\n",
r, result);
return result;
}
Again, you do not need to bother to find all the places where the volume is
computed using the doubling_time function; you need only to change
the doubling_time function's definition.