VS 2008 [RESOLVED] Large Numbers

VBNetDude · Nov 28th, 2009, 02:00 PM

Is there any container that would hold a number that is 10,000 characters in length? would I have to create one? If so how would I go about doing something like that?

ntg · Nov 28th, 2009, 02:33 PM

You'll have to make one. In order to do that, you'll have to think in terms of how two bytes are combined together to form an integer (and from there extrapolate for an n-byte number). When you add to a 2-byte number you start by adding to the least significant byte - if you get a carry, you add that to the most significant byte.

It works exactly like elementary arithmetic. I imagine you can code something that works in base-10 arithmetic or something that would work with base-2 arithmetic (bytes). Coding for base-10 would be intuitive and simple while coding for base-2 arithmetic would be faster.

Pradeep1210 · Nov 28th, 2009, 02:46 PM

Quote:

Originally Posted by VBNetDude

Is there any container that would hold a number that is 10,000 characters in length? would I have to create one? If so how would I go about doing something like that?

If you don't need it for calculation purposes, store it as string.

stanav · Nov 28th, 2009, 06:24 PM

What kind of number is that big... I can't imagine if I never need to use one

Anyway, what's you're looking for is "Big Integer" type. If you're targeting .Net 4.0 then it's the System.Numerics.BigInteger structure. If you're targeting .Net 3.5 and lower, you have to create your own.

VBNetDude · Nov 28th, 2009, 07:18 PM

Um, I am working with a number that is 10,000 Digits in length. It must be prime. I made a prime number finder that went through the selected starting and ending points, and listed all the prime ones. Now I want to expand that and see how large I can make the number. (Can you tell I have nothing to do?

)

Is there any way to import .Net 4.0 into VB 2008? I don't care what framework it targets because it is really just something to abide time until I have something better to do!

jmcilhinney · Nov 28th, 2009, 07:37 PM

Quote:

Originally Posted by VBNetDude

Is there any way to import .Net 4.0 into VB 2008? I don't care what framework it targets because it is really just something to abide time until I have something better to do!

No, you would have to download and install VS 2010 Beta 2. If you do so, I would recommend installing on a virtaul machine if you possibly can. You should avoid installing any beta software on a system that you can't happily reformat.

Nov 28th, 2009, 02:00 PM	#1
VBNetDude Addicted Member Join Date: Oct 09 Location: Clive, IA in America!!!! Posts: 201	[RESOLVED] Large Numbers Is there any container that would hold a number that is 10,000 characters in length? would I have to create one? If so how would I go about doing something like that? __________________ VBNetDude - Thinking Programmatically By Silver Seal Software Don't forget to mark your thread as "Resolved" using the Thread Tools menu on top. And don't forget to rate the answers that help you the most!

Nov 28th, 2009, 02:33 PM	#2
ntg Frenzied Member Join Date: Sep 04 Posts: 1,192	Re: Large Numbers You'll have to make one. In order to do that, you'll have to think in terms of how two bytes are combined together to form an integer (and from there extrapolate for an n-byte number). When you add to a 2-byte number you start by adding to the least significant byte - if you get a carry, you add that to the most significant byte. It works exactly like elementary arithmetic. I imagine you can code something that works in base-10 arithmetic or something that would work with base-2 arithmetic (bytes). Coding for base-10 would be intuitive and simple while coding for base-2 arithmetic would be faster. __________________ "Feel the force...read the source..." Utilities: POPFile • DebugView • Process Explorer • Wireshark • KeePass • UltraVNC • Pic2Ascii .Net tools & open source: DotNetNuke • log4Net • CLRProfiler Customer quote: "If the server has a RAID array, why should we bother with backups?" Programmer quote: "I never comment my code. Something that is hard to write should be impossible to comprehend."

Nov 28th, 2009, 06:24 PM	#4
stanav PowerPoster Join Date: Jul 06 Location: Providence, RI - USA Posts: 6,848	Re: Large Numbers What kind of number is that big... I can't imagine if I never need to use one Anyway, what's you're looking for is "Big Integer" type. If you're targeting .Net 4.0 then it's the System.Numerics.BigInteger structure. If you're targeting .Net 3.5 and lower, you have to create your own. __________________ Let us have faith that right makes might, and in that faith, let us, to the end, dare to do our duty as we understand it. - Abraham Lincoln -

Nov 28th, 2009, 07:18 PM	#5
VBNetDude Addicted Member Join Date: Oct 09 Location: Clive, IA in America!!!! Posts: 201	Re: Large Numbers Um, I am working with a number that is 10,000 Digits in length. It must be prime. I made a prime number finder that went through the selected starting and ending points, and listed all the prime ones. Now I want to expand that and see how large I can make the number. (Can you tell I have nothing to do? ) Is there any way to import .Net 4.0 into VB 2008? I don't care what framework it targets because it is really just something to abide time until I have something better to do! __________________ VBNetDude - Thinking Programmatically By Silver Seal Software Don't forget to mark your thread as "Resolved" using the Thread Tools menu on top. And don't forget to rate the answers that help you the most!

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