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it obviously needs to have the argc and argv
parameters that are passed to our main procedure,
but its also needs to know the arguments that it can
expect to see on the command line
how do we communicate the argument descriptions to
this procedure, what information do we need to know
about each argument?
for each argument there are three things that we need
to know, the flag for the argument, where the
argument's value is to be stored, and the type of the
argument's value
we can store this information in a table, or array,
with one entry for each parameter, this array is
called an argument description table, and is one of the
parameters that is passed to the process_arguments
procedure
how will process_arguments return the information
that it finds?
for arguments with flags this is easy, the argument
description contains pointers to the variables where
the values are to be stored
in the case of file name arguments, there are no
variables to return their values in, so we will return
them as the value of process_arguments
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