EOF                      End of File Status

 y = EOF(filenum)

    Checks for end of file.

     filenum    The number under which the file was OPENed.

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      Notes:    If the end of the file has been reached, EOF returns -1
                (true); otherwise, it returns 0 (false).

                If filenum refers to a random-access file, a -1 means the
                last GET statement did not read an entire record.

                If filenum refers to a communications file opened in
                binary mode, a -1 means the input queue is empty. If
                filenum refers to a communications file opened in ASCII
                mode, a -1 means a Ctrl-Z has been read.