Spaces. Generally speaking, spaces indicate lower priority operations. They are not as strict as parenthesis, but they are still a hint.
Thanks, -- Raul On Fri, Sep 27, 2019 at 3:47 PM Devon McCormick <devon...@gmail.com> wrote: > Why do you think the thing to right of "8÷" is anything other than "2"? > What rule says multiplication comes before division? > > On Fri, Sep 27, 2019 at 3:36 AM Bernie Eckhart <bernie.eckhart....@gmail.com> > wrote: > > > BEDMAS a.k.a. PEDMAS gives 1 imho. > > > > Surprisingly, given that Ken is in both live and, sadly after life, > > Canadian, my expectation is BEDMAS. > > > > Brackets (properly called "parentheses") > > > > (2+2) i.e. (4) > > > > Giving 8 ÷ 2( 4) > > > > again, this post is being written by a non-mathematician. > > > > .......... > > A mathematician walked into a bar. > > An order was pondered. > > An order was never placed. > > > > .......... > > A mathematician walked into a bar. > > The bartender was also a mathematician. > > A fight broke out. > > > > .......... > > BEDMAS is left to right. > > > > so what is to the right of the ÷ sign? > > > > I suggest it's an expression that evaluates to 8 > > > > Big question is what rule was broken. > > > > Answer imho round brackets were not used. > > > > To my eyes, in 2(4) > > 2 modifies (4) > > yielding 8 > > > > 8÷8 is 1 > > > > OTOH > > 8 ÷ 2 x (2+2) > > becomes > > 8 ÷ 2 x (4) > > which becomes > > 4 x (4) > > yielding 16 > > > > Rule learned in elementary school: > > confusion must be avoided with round brackets. > > > > non authouritative reference: > > en.wikipedia.org/wiki/order_of_operations > > > > On Sep 26, 2019 10:23, "'Mike Day' via Chat" <c...@jsoftware.com> wrote: > > > > Hardly worth commenting as it's a matter of convention, but > > I did this check with my Silverfrost/Plato Fortran 95, albeit in > > Fortran as I wrote it mid-20th C: > > > > Program: > > " > > print *, 8 / 2 * (2 + 2) > > end > > " > > Output: > > " > > 16 > > > > Press RETURN to close window... > > " > > > > Also, 8 / 2 * 2 + 2 is of course 10 as far as my Fortran is concerned. > > > > How different from J and APL ... and K (mine needs updating though!): > > "K 2.8t 2000-08-23 Copyright (C) 1993-2000 Kx Systems > > Evaluation. Not for commercial use. > > \ for help. \\ to exit. > > > > 8 % 2 * (2 + 2) > > 1.0 > > 8 % 2 * 2 + 2 > > 1.0 > > " > > > > Only chatting/cheating! > > > > Mike > > > > > > > > On 26/09/2019 06:07, Bernie Eckhart wrote: > > > as a non-mathemation, > > > seems obvious to me, > > > > > > reading left to right, > > > we have > > > > > > thing divided by an expression > > > > > > expanding the expression give 8; > > > > > > except for zero divided by zero, > > > > > > value divided by same value is AFAIK > > > always ONE, > > > > > > if this were a sentence, > > > 8 is the subject > > > divided by is the verb, and > > > 2(2+2) is the object. > > > > > > On Sep 25, 2019 04:28, "R.E. Boss" <r.e.b...@outlook.com> wrote: > > > > > > From > > > > > > > https://www.quantamagazine.org/the-math-behind-a-faster-multiplication-algorithm-20190923/ > > > “This summer, battle lines< > > > > > > > https://twitter.com/pjmdolI/status/1155598050959745026?ref_src=twsrc%5Etfw%7Ctwcamp%5Etweetembed%7Ctwterm%5E1155598050959745026&ref_url=https%3A%2F%2Fwww.nytimes.com%2F2019%2F08%2F02%2Fscience%2Fmath-equation-pedmas-bemdas-bedmas.html > > > > > > were drawn over a simple math problem: 8 ÷ 2(2 + 2) = ? If you divide 8 > > by > > > 2 first, you get 16, but if you multiply 2 by (2 + 2) first, you get 1. > > So, > > > which answer is right? The conflict grew so heated that it made the pages > > > of The New York Times< > > > > > > > https://www.nytimes.com/2019/08/02/science/math-equation-pedmas-bemdas-bedmas.html > > >. > > > And as the comments section shows, even a professional mathematician > > > weighing in on the matter wasn’t enough to bring the two sides together.” > > > > > > > > > > > > R.E. Boss > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > > -- > > This email has been checked for viruses by Avast antivirus software. > > https://www.avast.com/antivirus > > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > > -- > > Devon McCormick, CFA > > Quantitative Consultant > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
