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  Argument
 
    file_variable    Optional; open typed, untyped, or text file
                     (default is standard file Input)
 
  Returns
 
    Boolean          True if file is empty or current position is past
                     last element in file, otherwise False
 
  Description
 
    The Eof function returns a Boolean value indicating whether the
    current file position is beyond the last element in an open file
    of any type. It checks the current position in the file. If Eof
    finds an end-of-file marker, the actual end of the file, or an
    empty file, it returns True. If Eof finds any other character, it
    returns False. Eof does not change the current file position.
 
    For text files, the end-of-file marker is the character CTRL+Z
    (ASCII 26). The end-of-line marker is the character combination of
    carriage return (ASCII 13) and line feed (ASCII 10).
 
    Eof differs from the SeekEof function by not ignoring blanks, tabs,
    and end-of-line markers in determining whether the end of a file
    has been reached. Thus, SeekEof may be more useful than Eof for
    reading text files of numeric data.
 
    If file_variable is not associated with a file or if the file is
    not open when Eof is called, an I/O error occurs.
 
    To prevent a program from halting with a run-time error when an I/O
    error occurs, turn off I/O checking with {$I-} and check the return
    value of the IOResult function.