我需要一个大号码库。我一直在考虑将我的 项目转换为C ++，但目前我正在探索在C中保持 的途径。 什么是C的最佳大数字库？我需要能够 代表数字（95 ^ 63），大约是（2 ^ 6.6）^ 63， 大概是2 ^ 416，所以我们说的可能是一个512位的数字。 所以我需要能够在512位上进行除法和乘法运算。有没有人在这个特定的Big 号码库中有过很好的经历？
I need a Big Number library. I''ve been considering switching my project to C++ but at the moment I''m exploring the avenue of keeping it in C. What''s the best Big Number library for C? I need to be able to represent the number (95 ^ 63), which is approximately (2 ^ 6.6) ^ 63, which is about 2 ^ 416, so we''re talking about maybe a 512-Bit number. So I need to be able to do division and multiplication on a 512-Bit number. Has anyone here had good experiences with a particular Big Number library?
推荐答案Tomásóhéilidhe< to * @ lavabit写： Tomás ó héilidhe <to*@lavabitwrites: 我需要一个大数字库。我一直在考虑将我的 项目转换为C ++，但目前我正在探索在C中保持 的途径。 什么是C的最佳大数字库？我需要能够 代表数字（95 ^ 63），大约是（2 ^ 6.6）^ 63， 大概是2 ^ 416，所以我们说的可能是一个512位的数字。 所以我需要能够在512位上进行除法和乘法运算。有没有人在这个特定的Big 号码库中有过很好的经历？ I need a Big Number library. I''ve been considering switching my project to C++ but at the moment I''m exploring the avenue of keeping it in C. What''s the best Big Number library for C? I need to be able to represent the number (95 ^ 63), which is approximately (2 ^ 6.6) ^ 63, which is about 2 ^ 416, so we''re talking about maybe a 512-Bit number. So I need to be able to do division and multiplication on a 512-Bit number. Has anyone here had good experiences with a particular Big Number library?
GMP在非常多的平台上得到支持，而且由于花费了很多精力，因此非常有效优化它。它通过传统的机制实现了它的便携性 相当彻底的平台差异化配置阶段， 和充足的使用前处理器。在所有平台上，实际编译的代码只有少量 。 我使用GMP进行我所有的''小''bignum工作（最多几千） 位数。 对于更简单的东西，并设计有明确的意图 作为bignums如何学习的经验为作者和用户实施 ，还有一个名为 ''libtommath'的库，我认为这是公共领域。它可能不适用于36位la-la land中的，但似乎可以在现代的32位和64位架构中移植。 （我想我也是在16位架构上运行它。）这可能足以满足你的需求。 Google就是你的朋友。 菲尔 - 理查德希思菲尔德 - 请不要浪费你的时间邮寄不请自来的 回应我的签名的基督徒随意。 与基督教一样，社会主义最糟糕的广告是它的b $ b b信徒。 - 埃里克亚瑟布莱尔（1903-1950），通往威根码头的道路（1937年）
GMP is supported on a very large number of platforms, and is very efficient as it''s had a lot of effort spent optimising it. It achieves its portability via the traditional mechanism of a fairly thorough platform-differentiating configuration stage, and plenty of use of the pre-processor. Only small amounts of the code actually being compiled are identical on all platforms. I use GMP for all my ''small'' bignum work (up to a few thousand digits). For something simpler, and designed with the express intention of being a learning experience in how bignums can be implemented for both the author and user, there''s also a library called ''libtommath'' which is I believe public domain. It might not work in "36-bit la-la land", but seems to be portable across modern 32- and 64-bit architectures. (I think I''ve also run it on 16-bit architectures too.) That might be good enough for your needs. Google is your friend. Phil -- Richard Heathfield - please do not waste your time mailing unsolicited Christian ramblings in response to my signatures. As with the Christian religion, the worst advertisement for Socialism is its adherents. -- Eric Arthur Blair (1903-1950), The Road to Wigan Pier (1937)
10月27日下午1点41分，托马斯óhéilidhe< t。 .. @ lavabitwrote： On Oct 27, 1:41 pm, Tomás ó héilidhe <t...@lavabitwrote: 我需要一个大号码库。我一直在考虑将我的 项目转换为C ++，但目前我正在探索在C中保持 的途径。 什么是C的最佳大数字库？我需要能够 代表数字（95 ^ 63），大约是（2 ^ 6.6）^ 63， 大概是2 ^ 416，所以我们说的可能是一个512位的数字。 所以我需要能够在512位上进行除法和乘法运算。有没有人在这个特定的Big 号码库中有过很好的经历？ I need a Big Number library. I''ve been considering switching my project to C++ but at the moment I''m exploring the avenue of keeping it in C. What''s the best Big Number library for C? I need to be able to represent the number (95 ^ 63), which is approximately (2 ^ 6.6) ^ 63, which is about 2 ^ 416, so we''re talking about maybe a 512-Bit number. So I need to be able to do division and multiplication on a 512-Bit number. Has anyone here had good experiences with a particular Big Number library?
首先，在这里寻求关于图书馆的建议是偏离主题的。 你的问题（以及我的答案）是：
First of all, asking for advice on libraries here is off-topic. Your questions (and my answers) are:
什么是C的最佳大数字库？ What''s the best Big Number library for C?定义最佳（你的主题建议''完全便携''=''最好''，但是 你没有提到它在你的文章正文中）
Define best (your subject suggests ''fully portable'' = ''best'', however you don''t mention it in the body of your article)
这里有没有人对特定的Big 号码库有过良好的体验？ Has anyone here had good experiences with a particular Big Number library?是
Yes
vi ****** @ gmail 说： 10月27日下午1:41，Tomásóhéilidhe< t ... @ lavabitwrote： On Oct 27, 1:41 pm, Tomás ó héilidhe <t...@lavabitwrote: >我需要一个大号码库。我一直在考虑将我的项目转换为C ++，但目前我正在探索将它保存在C中的途径。 什么是最好的C的大数字库？我需要能够代表数字（95 ^ 63），大约是（2 ^ 6.6）^ 63，大概是2 ^ 416，所以我们说的也许是512位数。 所以我需要能够在512位数上进行除法和乘法运算。有没有人在这个特定的Big 数字库中有过很好的经历？ >I need a Big Number library. I''ve been considering switching myproject to C++ but at the moment I''m exploring the avenue of keepingit in C.What''s the best Big Number library for C? I need to be able torepresent the number (95 ^ 63), which is approximately (2 ^ 6.6) ^ 63,which is about 2 ^ 416, so we''re talking about maybe a 512-Bit number.So I need to be able to do division and multiplication on a 512-Bitnumber. Has anyone here had good experiences with a particular BigNumber library?
首先，在这里征求关于图书馆的建议是偏离主题的。
First of all, asking for advice on libraries here is off-topic.
为什么？在我看来，这个组的主题是C编程， 无论平台如何。库的使用肯定是编程的一部分。 好的，我能理解 - 并且同意 - 关于平台特定库的 使用的详细讨论在这里是偏离主题的，但是他要求的是一个完全便携的库。 我知道人们可能会因为帮助OP而异议的一个原因，但是 时尚性不是。 - Richard Heathfield< www.cpax .uk> 电子邮件：-http：// www。 + rjh @ 谷歌用户：< www.cpax.uk/prg/writings/googly.php> Usenet是一个奇怪的放置" - dmr 1999年7月29日
Why? It seems to me that the topic of this group is C programming, regardless of platform. Library usage is certainly a part of programming. Okay, I can understand - and agree - that detailed discussions on the usage of platform-specific libraries is off-topic here, but what he''s asking for is a fully portable library. I know of one reason why people might demur from helping the OP, but topicality isn''t it. -- Richard Heathfield <www.cpax.uk> Email: -www. +rjh@ Google users: <www.cpax.uk/prg/writings/googly.php> "Usenet is a strange place" - dmr 29 July 1999
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