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Of course, fscanf, fprintf, and fclose must
know about the structure variables in structures returned by calls to
fopen. You yourself need to know nothing at all about those structure
variables, because fscanf, fprintf, and fclose isolate
you from them. Accordingly, the actual structure variables included may
vary from implementation to implementation, as long as fscanf,
fprintf, fclose—and other input–output functions—perform
the right computations.
As you have learned, when you move the details of how information is stored behind a set of functions, you are said to be doing data abstraction, and you are said to be hiding the details of how a computation is done behind a data-abstraction barrier.