如何正确比较C＃十进制值？ [英] How to properly compare decimal values in C#?

问题描述

我来自C ++背景，我知道，你不能准确地比较浮点数是否相等。对于C＃，我只是假设同样的政策适用于十进制值，或一般的浮点值。

I come from a background in C++, and I know that you cannot accurately compare floats for equality. For C#, I simply assumed the same policy applies to decimal values, or any floating point value in general.

基本上，我有两个小数值，如果它们不相等给对方，我需要执行一些动作。 。例如：

Basically, I have two decimal values and if they are NOT equal to each other, I need to perform some action. e.g.:

decimal value1, value2;
// Assume value1 and value2 are set somewhere to valid values.
if( value1 != value2 )
{
    // Do something
}

如果如预期这不起作用，我愿意接受一个解决方案，它与误差幅度相等比较，说喜欢0.00001或类似的东西。什么是推荐的解决这个问题？

If this doesn't work as expected, I'm willing to accept a solution that does an equality comparison with a margin of error, say like .00001 or something like that. What would be the recommended solution to this problem?

推荐答案

按照预期的代码将工作。 C＃小数 s的优化，是在代表基地10个数字很准确，所以如果这是你比较什么（钱，...），一切都应该罚款。

Your code will work as expected. C# decimals are optimized to be very accurate at representing base 10 numbers, so if that's what you're comparing (money, ...), everything should be fine.

下面是关于小数由Jon飞碟双向的准确度非常明确的解释：

Here's a very clear explanation about the accuracy of decimals by Jon Skeet:

什么是十进制的区别float和double在C＃？

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