srand((无符号)(时间(NULL))); (rand())/(RAND_MAX/2) - 1 个 C# 等效项
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srand((unsigned)(time(NULL))); (rand())/(RAND_MAX/2) - 1 C# equivalent
提问by
What is the c# equivalent of the following c++:
以下 c++ 的 c# 等效项是什么：
srand((unsigned)(time(NULL)));
weight=(double)(rand())/(RAND_MAX/2) - 1;
回答by Frans Bouma
To do random value generation in .NET, you should use the Random class. to seed it with a time value, use: Random rand = new Random((int)DateTime.Now.Ticks);
要在 .NET 中生成随机值，您应该使用 Random 类。用时间值播种它，使用： Random rand = new Random((int)DateTime.Now.Ticks);
For further specifics, it's best to check out the docs about the Random class in the MSDN, e.g. which methods are available.
有关更多细节，最好查看 MSDN 中有关 Random 类的文档，例如哪些方法可用。
回答by schnaader
Random rnd = new Random((int)DateTime.Now.Ticks);
return rnd.Next(-1,1);
回答by ICR
The paramaterless constructor for Random uses "a time-dependent default seed value" so all you need is:
Random 的无参数构造函数使用“依赖于时间的默认种子值”，因此您只需要：
Random rnd = new Random();
return rnd.Next(-1, 1);
