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Once you have declared a file pointer, you arrange for it to point to a
file-describing structure that is created at run time by a function named
fopen, an acronym for file open. Note that the
call to fopen has two arguments: the first specifies the name of a
file, and the second specifies whether the file is to be read from, written
to, or appended to. Whenever the second argument is "r",
fopen prepares for reading:
file-pointer name = fopen(file specification, "r");
You do not need to know about the structure variables in the structure
created by fopen, because your access to the structure variables is
via access functions that know about them.