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Index > DOS > Arithmetic with big numbers

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alexa



Joined: 21 Apr 2006
Posts: 8
alexa
How write arithmetic operation(addition,subtraction,multiple,divide,modulo) for big numbers?(length operand more than 2048 bit)
Post 22 Apr 2006, 08:02
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
addition and subtraction are simple, look at adc and sbb instructions. multiplying is harder, there are few common algos how to do it. and dividing is hell. modulo is if course dividee - divider*(dividee / divider), wher "/" is ours whole-number division without remainder
Post 22 Apr 2006, 09:27
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Borsuc



Joined: 29 Dec 2005
Posts: 2466
Location: Bucharest, Romania
Borsuc
I'm also a bit interested in doing manual multiplication and division. vid, do you know some links around. that would be very helpful. thanks in advance Very Happy
Post 22 Apr 2006, 09:32
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
Post 22 Apr 2006, 12:40
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Madis731



Joined: 25 Sep 2003
Posts: 2140
Location: Estonia
Madis731
My program can do multiplications rather quickly, but its main purpose is powers like "1234 to the power of 5678". I started to look on the subject of Fourier Transforming the results, but no success, I just don't get it Sad
Check out the Projects section for the program.
Post 22 Apr 2006, 13:52
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
yes, FT is pretty complicated to comprehend, until you comprehend it Smile
Post 23 Apr 2006, 21:04
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