Automatic calculations reevaluates the whole equation when new operation is added - therefore 1 + 2 x 4 will be 9 as it should be. Simple question: do you have device or possibility to test current implementation? Trying live thing might get better feeling how it works.
Another idea: we could do testing with users who have not seen previously calculator and see how they react because we are guessing now. Preferably we should do that with non-technical users. Regards, Dalius On Mon, Mar 11, 2013 at 4:33 PM, Calum K Pringle < [email protected]> wrote: > Hi everyone hope you’ve had a nice weekend! > > Last week was a bit mad because of UDS, but we have honestly been thinking > about Calculators a lot of the time too! Dalius raised a good point about > the ‘equals’ feature, and as it came up on the blog too, we’ve cc’d the > list in our reply. > > *Why have an equals button? > * > We don't calculate automatically as it would muddy the order of > operations. 1 + 2 x 4 = 9. However, calculating automatically would result > in 1 + 2 = 3 X 4 = 12. > > Secondly, when two things happen at the same time on screen - displaying > typed entry AND answer - it can be confusing. > > It is common to find yourself pressing the equals button for confirmation > at the end of a calculation which also complements the physical metaphor we > have used for the calculation history. We have also found it to be a common > behaviour of simple calculators that pressing equals multiple times would > repeat the previous operation. > > *Why do we need +/ - key > * > From last weeks discussion (copy below) we realised that it was not > expected for subtract to be the entry point for making a negative number. > For that reason, and to fit in the layout, we opted to add this button. > > If we follow our own direction, prioritising things like daily budgeting > etc, minus might well be very useful! (Stay out of that overdraft!!!) > > Cheers, > > Calum > > -------- Original Message --------Subject:[Ubuntu-touch-coreapps] > [Calculator] Numpad layout designDate:Sat, 9 Mar 2013 14:57:42 +0200From: > Dalius <[email protected]> <[email protected]>To: > [email protected] > > Hi, > > Here is what design team proposes for simple calculator: > http://design.canonical.com/wp-content/uploads/numpad.png > > Here is our current implementation: > http://i.imgur.com/F2DqWdL.png > > Design team's proposal has two unnecessary buttons: > > = - as I don't see any reason why calculations can't be automatic > > ± - it is simple calculator why we need negative numbers at all? > > Any other opinions? > > Regards, > Dalius > > > > > Calum Pringle > Interaction Designer > > Canonical Design Team > m: 0773 9317055 > e: [email protected] > >
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