nag_close_file (x04adc) closes a file associated with a given file identifier (as returned by a call of nag_open_file (x04acc)).
On entry: the identifier of the file to be closed. This must have been returned by a call of nag_open_file (x04acc). Note that if the filename passed to nag_open_file (x04acc) was blank or NULL, nag_close_file (x04adc) does nothing.
– NagError *Input/Output
The NAG error argument (see Section 3.6 in the Essential Introduction).