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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!

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2 Answers

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).

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There are 2 free scripting languages that are good calculators too:

1. Octave
2. Python

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

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