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LOF
Function Provides the size of the file.
Format LOF ( <file number> )
Term <file number>: The number assigned to the file by the OPEN statement
Explanation The file specified in <file number> is:
1. Disk file
The file size is provided in units of bytes.
2. RS-232C communication file
The remaining number of bytes of the input buffer is returned. It is the result of
the LOC function value subtracted from the input buffer size