如何在C中生成随机数 [英] How to generate random numbers in C
问题描述
我需要在C中生成0到1之间的两个均匀随机数？
怎么做？
我研究了rand函数你在哪里需要#define RAND_MAX为1
但这个rand函数会给我统一分布和唯一的
数字吗？
I need to generate two uniform random numbers between 0 and 1 in C ?
How to do it ?
I looked into rand function where you need to #define RAND_MAX as 1
but will this rand function give me uniformly distributed and unique
numbers ?
推荐答案
4月10日，9：54 * pm，pereges< Brol ... @ gmail.comwrote：
On Apr 10, 9:54*pm, pereges <Brol...@gmail.comwrote:
我需要生成两个C中0到1之间的均匀随机数？
如何做？
I need to generate two uniform random numbers between 0 and 1 in C ?
How to do it ?
如果您有现代硬件和IEEE浮点数，我建议
dsfmt：
http：//www.math.sci.hiroshima -u.ac.j ... FMT / index.html
否则WELL512a.c和WELL512a.h来自：
是另一种可能性。
If you have modern hardware and IEEE floating point, I recommend
dsfmt:
http://www.math.sci.hiroshima-u.ac.j...FMT/index.html
otherwise WELL512a.c and WELL512a.h from here:
http://www.iro.umontreal.ca/~panneton/WELLRNG.html
Are another possibility.
我查看了rand函数，你需要#define RAND_MAX为1
但是这个兰特功能会给我*均匀分布和独特的
数字吗？
I looked into rand function where you need to #define RAND_MAX as 1
but will this rand function give me *uniformly distributed and unique
numbers ?
这是一个只读值。这不是你设置的东西，
这是你要查询的内容。
That is a read-only value for you. It''s not something that you set,
it is something that you inquire upon.
" pereges"写道：
"pereges" writes:
>我需要在C中生成0到1之间的两个均匀随机数？
怎么做？
我查看了rand函数，你需要#define RAND_MAX为1
但是这个rand函数会给我统一分布和唯一的
号码？
>I need to generate two uniform random numbers between 0 and 1 in C ?
How to do it ?
I looked into rand function where you need to #define RAND_MAX as 1
but will this rand function give me uniformly distributed and unique
numbers ?
常见问题解答中的有用信息从大约13.15开始
http://www.c-faq.com/lib/index.html
一组数字不应该是随机且唯一的。随机数生成器的一个重要的
属性是可以重复数字。要
提供我理解你想要的东西，请查看shuffle。如
13.19
There is useful information in the FAQ starting at about 13.15
http://www.c-faq.com/lib/index.html
A set of numbers shouldn''t be random AND unique. One of the important
properties of a random number generator is that numbers can be repeated. To
provide what I understand you to want, look into "shuffle" as described in
13.19
文章< 9c ****************** **************** @ s33g2000pri。 googlegroups.com>，
pereges< Br ***** @ gmail.comwrote：
In article <9c**********************************@s33g2000pri. googlegroups.com>,
pereges <Br*****@gmail.comwrote:
>我查看了rand函数你需要在哪里#define RAND_MAX为1
>I looked into rand function where you need to #define RAND_MAX as 1
RAND_MAX告诉你最大随机数是多少。它没有b $ b b让你控制它。
RAND_MAX tells you what the maximum random number is. It doesn''t
let you control it.
>但这个rand函数会给我统一分布和唯一的
数字？
>but will this rand function give me uniformly distributed and unique
numbers ?
>我需要在C中生成0到1之间的两个均匀随机数？
>I need to generate two uniform random numbers between 0 and 1 in C ?
rand（）返回0到RAND_MAX之间的整数。打算统一分配
（虽然标准看起来并不像
这样说）所以你可以得到均匀分布的随机浮点
数字类似
（（double）rand（））/ RAND_MAX
如果你真的需要*独特*随机数你必须要b / b $ b做一些更复杂的事情。你确定你真的这么做吗？
- Richard
-
：wq
rand() returns an integer between 0 and RAND_MAX. It''s intended
to be uniformly distributed (though the standard doesn''t seem to
say so) so you can get uniformly distributed random floating-point
numbers by something like
((double)rand()) / RAND_MAX
If you really need *unique* random numbers you''re going to have to
do something more complicated. Are you sure you really do?
-- Richard
--
:wq
这篇关于如何在C中生成随机数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
