Windows 7 calculator can't count in binary!

 Having a play around with the W7 calculator in 'programmer' mode.

Set radix to DEC and width to byte.

Now try and enter 255.
Set radix to HEX,keep width as byte enter FF

No problem; now click on DEC you don't get 255, but -1

I recall that in XP the calculator had problems with some logarithms.

Colin
 
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cdb,  on 17/06/2010



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> -----Original Message-----
> From: [hidden email] [mailto:[hidden email]] On
Behalf
I don't have Windows 7 to check, but has anything been added to the
calculator to enable hex values to be interpreted as signed?

-1 is perfectly correct for an 8 bit signed value of 0xFF, but it's
certainly different to the way the old XP calculator works (which would
happily translate signed decimal to hex, but all hex to decimal
conversions are unsigned).

Mike

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:: has anything been added to the
:: calculator to enable hex values to be interpreted as signed?

All is now clear - it treats all programming numbers as signed. In decimal
I can enter 127 but not 128.

However in hex or binary it works as unsigned.

To me that seems like a piece of inconsistent programming.

Colin


 
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cdb, [hidden email] on 17/06/2010
 
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cdb wrote:
> Set radix to DEC and width to byte.
>
> Now try and enter 255.
> Set radix to HEX,keep width as byte enter FF
>
> No problem; now click on DEC you don't get 255, but -1

So?  -1 is just as correct as 255.  You thought of it as a unsigned byte and
they as a signed byte.  Neither is wrong unless it was specified to be one
or the other.


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Does it happen even if your number size set to qword or byte?

Tamas


On Thu, Jun 17, 2010 at 11:40 AM, cdb <[hidden email]> wrote:



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q="\"",s,q,q,a="\\",q,q,q,a,a,q); }
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--------------------------------------------------
From: "Michael Rigby-Jones" <[hidden email]>
Sent: Thursday, June 17, 2010 12:27 PM
To: "Microcontroller discussion list - Public." <[hidden email]>
Subject: RE: [OT]Windows 7 calculator can't count in binary!

Yes, that was my guess too, but..
I'm on Vista with the old calculator - so I downloaded the win7 version from
here:
http://www.box.net/shared/y7tdnm9y2a#Windows7-calculator

It looks like it is obviously treating all values as signed -  ffff
translates to -1 in word mode, fe ttranslates to -2 in byte etc. However, I
can't see any setting to change this (maybe I'm not looking in the right
place though)

 


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At 08:07 AM 17/06/2010, you wrote:
>:: has anything been added to the
>:: calculator to enable hex values to be interpreted as signed?
>
>All is now clear - it treats all programming numbers as signed. In decimal
>I can enter 127 but not 128.
>
>However in hex or binary it works as unsigned.

It's always treated as 2's complement signed, no? Where is the
inconsistency? Did you find an operation where it's actually
treated as unsigned?

>To me that seems like a piece of inconsistent programming.
>
>Colin

Well, it would be nice for those of us who program if it would
allow a selection of 2's complement, 1's complement and unsigned
as did the venerable HP16C hand-held calculator. But there are
plenty of emulations of the HP16 around, some free.

More annoying than that, at least for me, is that they created
a new data display mode "DEC" which is a signed integer of
whatever width, and eliminated the "DEC" in the XP calculator,
which is really a floating point number. You can switch views to
scientific and get the floating point but when you go back to convert
to hex and maybe do some shifts or whatever, the calculator clears, so
you have to pass the number through the clipboard. Ugly compared
to the old way. Fortunately, the old XP calculator works fine in
Win 7 64-bit, so I just copied it over.

To see the difference, try to calculate something like
the hex value of 32768*sin(x) where x = pi/4 or whatever,
(answer is 0x5A82)

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
[hidden email]             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



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On Jun 17, 2010, at 5:25 AM, Oli Glaser wrote:

> It looks like it is obviously treating all values as signed -  ffff
> translates to -1 in word mode, fe ttranslates to -2 in byte etc.  
> However, I
> can't see any setting to change this

I have "geekcalc" on my Mac, and it has separate settings for int32/
uint32, int8/uint8, etc and hex, decimal, octal, binary, float, ascii...

BillW

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