lof - get file length
Lof returns the length of the file given by fn. If fn is
zero, the current file is used (see initio(io)). If the file is a tty,
lof returns zero. If the file is a pipe, this function returns the
number of characters currently buffered in the pipe. The length of a file is
measured in bytes. For a file open for output only, the length of the file is
also the current location. Although the value returned is always a whole
number, this function returns a float to provide for large files.
This function implements the BASIC LOF function.
This function resets the current file.
Error 52 (Bad file number) is generated if fn does not refer to an open
The Basmark QuickBASIC Programmerís Manual