Interesting stuff with the BCD calculation there. Did you write
all math functions from scratch?

I am entering the digits into a string and then convert and store it using
the iOS (Objective C to be more precise) internal number format, which is
able to store and calculate with too many digits I cannot even display all
of them. That works for basic things very well and has a very high
precision, but for few functions I need to convert that to 64 bit double
and use the math library and then convert that back to the internal type --
which obviously losing some precision, but still, it is good enough for
most things I hope.

Do you have links to your calc?

Tamas


On 5 April 2013 04:15, Chris Roper <caroper@gmail.com> wrote:

> I haven't tried coding for iOS or Android but I hear what you say about
> the complexity of Calculator design.
>
> I have coded emulations of several HP models in the past and it was an ey=
e
> opening experience. Especially good at teaching you the short comings of
> the Float Type  in most languages. I reverted to performing BCD Arithmeti=
c
> like HP did in most of their models.
>
> I bought the DVD set from the HP Calculator Museum and it was a great hel=
p.
>
>
>
>
>
> On 5 April 2013 12:54, Tamas Rudnai <tamas.rudnai@gmail.com> wrote:
>
> > Thank you!
> >
> > Well, a simple four function calculator is one of the most popular type
> of
> > projects for picking up iOS development. Adding newer and newer feature=
s
> > just makes the whole lot complicated by the end. At first I thought thi=
s
> > will be super easy, then ended up fairly complex code. However the most
> > difficult I have found was to design it, what functions to include, how
> to
> > arrange the buttons yet to keep it relatively simple to use. And of
> course
> > endless hours of bug fixing and polishing the user experience. Now I
> have a
> > different respect to calculator manufacturers like TI and HP :)
> >
> > To pick up iOS development the best I have found is to subscribe to one
> of
> > the free courses on iTunes U (iTunes University). You can follow lesson=
s
> > from Stanford for example on your Mac or iPad or iPhone even. That
> teaches
> > you Objective C as well as the architectures and the API and a bit more=
..
> It
> > is good fun :)
> >
> > Tamas
> >
> > Sent from my iPad
> >
> > On Apr 4, 2013, at 10:58 PM, Scott <goldscott@gmail.com> wrote:
> >
> > > Just downloaded and played with the app a bit. Great features for a
> > software/electrical engineer. Thank you!
> > >
> > > How difficult was it to build? I've been interested in iOS developmen=
t
> > for a while now but haven't jumped in yet.
> > >
> > > -Scott
> > > --
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--=20
int main() { char *a,*s,*q; printf(s=3D"int main() { char *a,*s,*q;
printf(s=3D%s%s%s, q=3D%s%s%s%s,s,q,q,a=3D%s%s%s%s,q,q,q,a,a,q); }",
q=3D"\"",s,q,q,a=3D"\\",q,q,q,a,a,q); }
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.