Math.Round返回四舍五入为奇数值，但几轮下来，即使 [英] Math.Round returning a rounded up for odd values but rounds down for even

问题描述

我试图找到使用数学轮
浮点我发现下面的

  0.5  - > 0 
 1.5  - > 2 
 2.5  - > 2 
 3.5  - > 4 
  

等。
我相信这是由于浮点错误，但不太清楚如何。
我怎样才能解决这个如此偶数轮是否正确？

解决方案

从的文档;

最近的一个整数。 如果的小数部分是两个整数，其中之一是，即使和其他奇怪，那么
连，则返回数。请注意，此方法返回的中间
双
，而不是整型。

Math.Round 方法有一些重载这需要的 MidpointRounding 作为一个参数，你可以，如果它是中间两个数字之间指定舍入值。

  AwayFromZero 
  

当一个号码是中途两个人之间，它朝向$ b $四舍五入b是远离零最接近的数字。

  ToEven 
  

在一些介于两个人之间，它向最接近的偶数的
四舍五入。

I am trying to found a float using math round I found the following

0.5 --> 0
1.5 --> 2
2.5 --> 2
3.5 --> 4

and so on. I believe this is due to floating point error, but not quite sure how. How can I get around this so even numbers round properly?

解决方案

From documentation;

The integer nearest a. If the fractional component of a is halfway between two integers, one of which is even and the other odd, then the even number is returned. Note that this method returns a Double instead of an integral type.

Math.Round method has some overloads that takes MidpointRounding as a parameter which you can specify the rounding value if it is midway between two numbers.

AwayFromZero 

When a number is halfway between two others, it is rounded toward the nearest number that is away from zero.

ToEven

When a number is halfway between two others, it is rounded toward the nearest even number.

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