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Possible Duplicate:
What super-calculator do you use?
I need a calculator program that runs on Windows 7 that can do two's complement conversions. Specifically convert a two's complement to regular decimal or binary. I'm told that the Win 7 calc does this.
Can anyone give a clear, specific example of how to do this on the built-in calc (or any other freely available program)? Thanks!
ssvarc
Posted 2010-02-15T15:31:05.203
Reputation: 720
4
The standard calculator has this built in.
Select View > Programmer (Alt + 3).
From PlanetMath:
Additionally, negative numbers are shown in two's complement (and the sign change key performs two's complement on the displayed value).
ChrisF
Posted 2010-02-15T15:31:05.203
Reputation: 39 650
1I'm looking at the programmers view and I saw this calculator before I posted. I don't see here how to do coversions to/from twos complement and I would appreciate some specific help. Thanks! – ssvarc – 2010-02-15T16:09:03.703
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There are 2 free scripting languages that are good calculators too:
The solution for two's complement in each of those languages for the number 8923:
Octave
bitcmp(8923, 16)
where 16 is the number of bits in the result
56612
this is because octave only deals with positive numbers in bitwise operations
Python
~8923
results
-8924
To convert from binary to decimal
Octave
bin2dec("10001011011011")
result
8923
To convert from 2' complement to decimal
Octave
bitcmp(bin2dec("10001011011011"), 16)
result
56612
PS: Octave commands are supposed to work in Matlab too
Jader Dias
Posted 2010-02-15T15:31:05.203
Reputation: 13 660
I'm looking to convert from two's complement to decimal or regular binary. – ssvarc – 2010-02-15T16:14:27.060
@Ssvarc I edited to show how to convert from two's complement – Jader Dias – 2010-02-15T17:32:41.707
@Ssvarc the inverse operation of the two's complement is itself. So if you seek to convert to or from is the same thing – Jader Dias – 2010-02-15T17:33:35.747
I still don't follow. Sorry. If what your trying to say is that a two's complement number and it's counterpart in regular binary is the same, then no, that is not correct. (I see that you realize this based on your examples above, so obviously there is something missing here.) – ssvarc – 2010-02-17T06:49:00.947
@Ssvar I fear I couldn't make myself clear. What I am saying is that bitcmp(bitcmp(x)) is equal to x – Jader Dias – 2010-02-17T14:24:13.543
Can you please tell me how one does that on the built in calculator? Thanks! – None – 2010-02-15T15:33:28.880
2View -> Programmer or Alt + 3 – Robin Day – 2010-02-15T15:34:10.087
I'm looking at the programmers view and I saw this calculator before I posted. I don't see here how to do coversions to/from twos complement and I would appreciate some specific help. Thanks! – ssvarc – 2010-02-15T15:38:42.690
1@ssvarc - Your question has been migrated here, where it is more adapted. To regain ownership over your question, you should associate your Super User account with your Stack Overflow one in user options. When done, I recommend you to edit your question according to your last comment. Because if your question remains the generic "looking for calculator program", then we have a duplicate here, and your question will be closed. – Gnoupi – 2010-02-15T16:45:16.173
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this question is not a duplicate of http://superuser.com/questions/21950/what-super-calculator-do-you-use -- while some of those tools might have the feature requested, this question also asks how to use that feature. please do not close this as a duplicate.
– quack quixote – 2010-02-15T17:33:05.043In which case the OP can post a new question stating exactly that. I single feature or help on how to use something does not make it less then a duplicate. Therefore he asked two separate questions. – BinaryMisfit – 2010-02-17T08:03:26.300