PPT Slide
Information for data transfer
- Data transfer characteristics are specified by the following items called control information.
(1) The direction of data transfer (input or output)
(2) The external device, or unit, to or from which data is to be transferred
(3) The format description that specifies conversion between the computer-oriented internal form of data and its representation as a character string.
(4) (Optional) Positioning action that is to occur at the end of data transfer (Advancing; if the file on the external device is to be repositioned to the end of the current record. Non advancing; if the file position is to remain in its place within the current record)
(5) (Optional) Exception handling to be performed in the event of an end-of-file, end-of-record, or error condition during data transfer.