On Sun, 11 Mar 2012 15:45:05 +1300, RussellMc wrote: :: Reverse the order of the two indivisible* portions. :: A =3D (1 + 2) * 6 / 2 Yes, but,ignoring RPN for a moment, surely the 'convention' is that a=20 bracketed sum is performed first and then depending on the incarnation (of= =20 compiler) the next sequence would be to read the remaining operators with=20 the same precedence in left to right order. In which case as my trusty Casio states, the answer is 1, only if the=20 division is performed first does the result come to 9 as per other=20 algorithms. Colin -- cdb, colin@btech-online.co.uk on 11/03/2012 =20 Web presence: www.btech-online.co.uk =20 =20 Hosted by: www.justhost.com.au =20 =20 This email is to be considered private if addressed to a named individual= =20 or Personnel Department, and public if addressed to a blog, forum or news= =20 article. =20 =20 =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .