' file size
' Return the entire message, FILELEN returns a NUMBER
FUNCTION printlen$(STRING name$)
    IF FILEEXISTS(name$) THEN
        RETURN name$ & ": " & STR$(FILELEN(name$))
    ELSE
        RETURN "file " & name$ & " not found"
    END IF
END FUNCTION

PRINT printlen$("input.txt")
PRINT printlen$("/input.txt")