我怎样才能在C＃100多个十进制数字？ [英] How can I get more than 100 decimal digits in C#?

问题描述

是否有可能获得超过100位小数在C＃？

Is it possible to get more than 100 decimal digits in C#?

如果有什么是code中的必要部分？

If yes what is the necessary portion of code?

在Java中有什么呼叫的BigDecimal ，但它仍然不能达到超过55位。

In Java there something call BigDecimal but it still can't reach more than 55 digits.

推荐答案

下载J＃可再发行获得J＃类库。 这篇文章暗示有关如何使用它来获取ZIP-能力的.NET项目，并解释了一些关于BigDecimal的，但是作为Ramhound解释，这篇文章也比较老了。

Using J# libraries:

Download the J# Redistributable to obtain the J# class libraries. This article hints about how to use it to get ZIP-ability in your .NET projects, and explains a bit about BigDecimal, but as Ramhound explained, the article is relatively old.

下载后， vsjlib 添加到项目中。我在.NET 4.0中它没有工作，但它没有工作在2.0的项目。它包含一个BigDecimal类，等等。不知道，但是，如果让你达100小数，但你可能会尝试一下。

After download, add the vsjlib to your project. It didn't work for me on .NET 4.0, but it did work on 2.0 project. It contains a BigDecimal class, among others. Not sure, however, if that gives you up to 100 decimals, but you might give it a try.

您可以下载一个包装的 MPIR 库的。NET这里（下载版0.2）。然后，请执行以下操作：

You can download a wrapper for the MPIR library for .NET here (download version 0.2). Then, do the following:

• DLL 添加文件 \包装。*。您的项目，确保每个构建它们复制到您的调试或发布目录。
• 添加 \包装\ xmpir.cs 到项目

• 添加以下code到项目：

• Add the the files \wrapper.*.dll to your project, make sure that on each built they are copied to your Debug or Release directory.
• Add \wrapper\xmpir.cs to your project

• Add the following code to your project:

// set the precision to 512 bits (adjust this to your needs)
mpir.mpf_set_default_prec(512);
ulong default_prc = mpir.mpf_get_default_prec();

// init vars (important!)
mpir.mpf_t val = mpir.mpf_init_set_d(.5);
mpir.mpf_t result = mpir.mpf_init_set_ui(0);

// calculate 0.5^200
mpir.mpf_pow_ui(result, val, 200);
double dresult = mpir.mpf_get_d(result);

// convert result to a string, in the form 1.2345 (dot not in output) and exp holding exponent
long exp;
string sresult = mpir.mpf_get_string(out exp, 10, 0, result);

// free vars (important!)
mpir.mpf_clear(val);
mpir.mpf_clear(result);

注意变量 sresult 仅将显著数字。你必须添加逻辑打印指数为好，或者一串零的。

Note that the variable sresult will only hold the significant digits. You'll have to add the logic for printing the exponent as well, or a bunch of zeroes.

结果是<$c$c>6.2230152778611417071440640537801242405902521687211671331011166147896988340353834411839448231257136169569665895551224821247160434722900390625E-60

一个文档PDF文件展示了如何使用它更详细

A documentation PDF file on the full MPIR library shows how to use it in more detail.

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