Math.Sin给我错误的答案吗？(Is Math.Sin giving me the wrong answer? [duplicate])

Math.Sin给我错误的答案吗？(Is Math.Sin giving me the wrong answer? [duplicate])

这个问题在这里已经有了答案：

Math.Cos＆Math.Sin在C＃ 5中的答案

我正在尝试使用Math.Sin（）来计算sin（pi弧度）。 我正在使用下面的代码。

double degrees = 180; double radians = Math.PI / 180 * degrees; Console.WriteLine(Math.Sin(radians));

它给了我一个值

1.22460635382238E-16

这是什么原因？ 当然，它应该返回一个值为0的权利？

请赐教。 谢谢。

This question already has an answer here:

Math.Cos & Math.Sin in C# 7 answers

I am trying to calculate sin(pi radians) using Math.Sin(). I am using the following code.

double degrees = 180; double radians = Math.PI / 180 * degrees; Console.WriteLine(Math.Sin(radians));

It is giving me a value of

1.22460635382238E-16

What is the reason for this? Surely it should be returning a value of 0 right?

Please enlighten me. Thanks.

最满意答案

1.22460635382238E-16基本上是0.它实际上代表了数字

0.000000000000000122460635382238。 这个数字接近于0.这基本上只是因为所有不同的舍入错误。

请参阅http://en.wikipedia.org/wiki/Floating_point以获取更多信息。

1.22460635382238E-16 basically is 0. it actually represents the number

0.000000000000000122460635382238. This number is close to 0. It's basically just because of different rounding errors all coming together.

take a look at http://en.wikipedia.org/wiki/Floating_point for more information.