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Recall that, if you are using Unix or Dos, you can redirect input from
your keyboard to a file, enabling you to use the program in Segment 331
to find the volumes of box cars that you have described in a file. The
only new fact that you need to know is that input expressions evaluate to
0 when the end of a file is encountered.
Thus, to find the volumes of some boxes described in a file, you need only
to type the following to your operating system, assuming that you have
called your box-analyzing program box_car and that you have prepared
a test file named test_data:
box_car < test_data