CODEWITHSUNDEEP
c#.netmathbigdecimal
Moons
Moons

Reputation: 3854

How to handle float values that are greater than the maximum value of double

I have values greater than 1.97626258336499E-323

I cant use BigInteger also as it handler only integer values

Any help is appreciated

Here is the code that failed also failed with some solution given by some users:

BigValue / (Math.Pow((1 + ret), j));

WHere BigValue is something like 15000.25

ret is -0.99197104212554987

And j will go to around 500-600.

I am not gettting how to use Rational Class for this too

Upvotes: 6

Views: 2599

Answers (5)

Eric O'Brien
Eric O'Brien

Reputation: 9

Here is something that may be useful. I used it a while back with no problem. It is a .Net BigDecimal class, you can download it from codeplex(or just look at the source):

http://bigdecimal.codeplex.com/releases/view/44790

It is written in VB.Net (.Net 4.0), but that shouldn't matter.

An example of its use in C#: http://www.dreamincode.net/forums/blog/217/entry-2522-the-madman-scribblings/

Upvotes: 1

user85109
user85109

Reputation:

Learn how to use logs to work with numbers like these. Yes, you CAN use a big float package, but that is overkill almost always. You can usually get what you need using logs.

Upvotes: 0

wich
wich

Reputation: 17127

One solution might be to do your problems in log space instead.

your example would become:

exp(log(Number) - log(1-0.9999999) * 400)

Upvotes: 0

Christopher Currens
Christopher Currens

Reputation: 30695

BigRational from the base class library team from Microsoft. It uses big integers to store it as a fraction, but supports all kinds of operators.

When it comes to printing it as a decimal, I think you need to write your own implementation for that. I have one written somewhere for this class, but I'd have to find it.

Upvotes: 1

Gene
Gene

Reputation: 46960

You will have to switch languages to one that has a BigFloat type (e.g. Haskel and Python have native packages) or else find a third party big float library with a C# binding. There was some discussion of such a binding for GNU MP, but it faded away. Maybe you'll write one!

See also this discussion where MS BigRational is discussed. However this is different from BigFloat.

Upvotes: 0

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