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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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Returns the length of a file in bytes.
 
LOF(filenumber%)
 
    ■ filenumber%    The number of an open file.
 
Example:
    INPUT "Enter filename: "; f$
    OPEN f$ FOR BINARY AS #1
    PRINT "File length = "; LOF(1)
    CLOSE