Text 22297, 59 rader
Skriven 2015-03-30 09:23:04 av Marc Lewis (1:396/45.0)
  Kommentar till text 21953 av mark lewis (1:3634/12.0)
Ärende: RE: order of operations
===============================
Hello mark.

<On 24Mar2015 13:53 mark lewis (1:3634/12) wrote a message to Björn Felten
regarding order of operations >

[snip]
 BF>    Highest order here is multiplication and division:

 BF>    6 - (1*0) + (2/2) = 6 - 0 + 1 = 7

 ml> PEMDAS: 7

 BF>    Correct.

 ml> yes, by one set of rules...

 ml> L2R : 1

 BF>    Incorrect.

 ml> not according to another set of rules...

 ml> for example, on a simple calculator this is the answer returned but
 ml> if you switch that calculator into scientific mode then the PEMDAS
 ml> answer is returned... several of the software calculators i have
 ml> tested operate like this... i also have a few physical calculators
 ml> that also operate like this... i think i might be able to dig out
 ml> our old HP calculator that uses RPN notation and test that one but
 ml> i'm not sure it will even turn on any more... 

Here's RPN:
-o-o-o-o-o-o-o-o-CUT-o-o-o-o-o-o-o-o-o-
RPN Engineering Calculator Running Tape Display  --  03/30/2015
 1 1.00                 Enter
 2 0.00
 3 0.00                   X
 4 6.00                 Enter
 5 6.00                   +
 6 2.00                 Enter
 7 2.00
 8 1.00                   /
 9 7.00                   +
 Registers
x-reg: 7.000e+00  |  y-reg: 0.000e+00  |  Lastx: 1.000e+00  |  Bank: 1
reg 1 :  |  reg 2 :  |  reg 3 :  |  reg 4 : 
reg 5 :  |  reg 6 :  |  reg 7 :  |  reg 8 : 
reg 9 :  |  reg 10 : |  reg 11 : |  reg 12 : 
reg 13 : |  reg 14 : |  reg 15 : |  reg 16 : 
reg 17 : |  reg 18 : |  reg 19 : |  reg 20 : 
reg 21 : |  reg 22 : |  reg 23 : |  reg 24 : 
 Bank Stack Value
 1 7.000e+00
-o-o-o-o-o-o-o-o-CUT-o-o-o-o-o-o-o-o-o-

Best regards,
Marc

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