Why Integer Size is 2,147,483,647

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Hi Experts,

I have face many time a Question. why the Integer size is 2,147,483,647 .
What numeric datatype we are using if the length of data is more then 80 characters.

If you have any suggestion or Solution for that then pls share it.

Thanks

Posted 25-Feb-13 6:50am

Anubhava Dimri

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Richard C Bishop 25-Feb-13 12:52pm

Use a long datatype. However, I am not sure even a long can handle 80 characters.

[no name] 25-Feb-13 12:55pm

The Question is Why?? Just imagine the 9999999999999999999999999999999999999999999999999999999999 is an integer value . then what datatype will be use.

joshrduncan2012 25-Feb-13 12:59pm

Is there something that you didn't understand about rich's answer. Can you elaborate more as to the context behind your question if you don't understand rich's answer? If a long can't be used, you may have to add a custom class for a BigInt.

[no name] 25-Feb-13 13:08pm

thanks for the support. Can u pls expain me how can i create the class there i can store this value.

joshrduncan2012 25-Feb-13 13:11pm

I strongly suggest googling for source code for the BigInteger class in C#. There are several websites available, and there is also one description here on CodeProject available.

BC @ CV 25-Feb-13 13:01pm

If you need whole numbers you could use this.
If you need really large floating points you could use this.

[no name] 25-Feb-13 13:08pm

thanks for the support. Can u pls expain me how can i create the class there i can store this value.

BC @ CV 25-Feb-13 13:47pm

To load BigInteger with a number larger than a long or double you will need to use a byte array. If you use the number class on the blog, you can just use a string like so:

Number myBigFatGreekNumber = new Number("3.141592653589793238462643383279502884197169399375105820974944592307816406");

Richard C Bishop 25-Feb-13 13:02pm

It is that size because that is the max value a 32-bit integer can hold. I told you, a "Long" is one of the largest numerical datatype, but I don't think it can handle an 80 character number.

Sergey Alexandrovich Kryukov 25-Feb-13 14:01pm

Please see my answer.
—SA

[no name] 25-Feb-13 13:01pm

Because that is the largest value you have have in a 32 bit integer (2 ^ 32 - 1). If you want something larger use the BigInteger class.

[no name] 25-Feb-13 13:08pm

thanks for the support. Can u pls expain me how can i create the class there i can store this value.

ZurdoDev 25-Feb-13 13:18pm

Give an example of what you need.

Sergey Alexandrovich Kryukov 26-Feb-13 19:55pm

Please stop posting non-answers as "solution". It can give you abuse reports which eventually may lead to cancellation of your CodeProject membership.
Comment on any posts, reply to available comments, or use "Improve question" (above).
Also, keep in mind that members only get notifications on the post sent in reply to there posts.
—SA

2 solutions

Solution 1

No, the sizes of integers types are 1, 2, 4, 8, 16, 32, 64 or maybe 128 bytes…

On the presentation of integer values, please see: http://en.wikipedia.org/wiki/2%27s_complement[^].

This is by far the most usual representation. This article should explain everything to you.

—SA

Posted 25-Feb-13 8:00am

Sergey Alexandrovich Kryukov

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Matt T Heffron · Accepted Answer · 2013-02-25T08:05:00

Solution 3

Add a reference to the System.Numerics assembly, then add using System.Numerics; to the c# source and then declare your numbers using the type BigInteger instead of int.

Posted 25-Feb-13 8:05am

Matt T Heffron

Updated 25-Feb-13 8:07am

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