为什么1.2％0.01不等于零？ [英] Why does 1.2 % 0.01 not equal to zero?
问题描述
由于舍入误差，余数不为零。如何删除
舍入错误？
The remainder is non zero due to rounding errors. How can I remove the
rounding errors?
推荐答案
On Sun，2008年8月3日14:54:26 -0700 ，Bernard.Mangay< fc **** @ googlemail.com>
写道：
On Sun, 03 Aug 2008 14:54:26 -0700, Bernard.Mangay <fc****@googlemail.com>
wrote:
由于四舍五入，余数不为零错误。如何删除
舍入错误？
The remainder is non zero due to rounding errors. How can I remove the
rounding errors?
与处理任何浮点舍入错误的方法相同
计算：不要指望确切的结果。相反，任何时候你想做比较，你需要决定接近足够好的程度。并且
将其纳入您的比较中。
例如：
double result = 1.2％0.01;
if（结果< 0.000001）
{
//也可能为零！
}
The same way you deal with rounding errors with any floating point
calculation: don''t expect exact results. Instead, any time you want to do
a comparison, you need to decide how close is "good enough" and
incorporate that into your comparison.
For example:
double result = 1.2 % 0.01;
if (result < 0.000001)
{
// might as well be zero!
}
8月3日，11：01 * pm，Peter Duniho < NpOeStPe ... @nnowslpianmk.com>
写道：
On Aug 3, 11:01*pm, "Peter Duniho" <NpOeStPe...@nnowslpianmk.com>
wrote:
On Sun，2008年8月3日14:54:26 -0700 ，Bernard.Mangay< fcm ... @ googlemail.com *
写道：
On Sun, 03 Aug 2008 14:54:26 -0700, Bernard.Mangay <fcm...@googlemail.com*
wrote:
由于舍入误差，余数不为零。如何删除
舍入错误？
The remainder is non zero due to rounding errors. How can I remove the
rounding errors?
处理任何浮点舍入错误的方式相同*
计算：不要指望确切的结果。 *相反，任何时候你想要比较，你需要决定足够好的接近程度。并且*
将其纳入您的比较中。
例如：
* * * double result = 1.2 ％0.01;
* * * if（结果< 0.000001）
* * * {
* * * * * //也可能是零！
* * *}
The same way you deal with rounding errors with any floating point *
calculation: don''t expect exact results. *Instead, any time you want todo *
a comparison, you need to decide how close is "good enough" and *
incorporate that into your comparison.
For example:
* * *double result = 1.2 % 0.01;
* * *if (result < 0.000001)
* * *{
* * * * *// might as well be zero!
* * *}
我认为这可行，但有时会给我剩余的
0.099999999未能通过你建议的修复。
I thought that might work, but sometimes it gives me a remainder of
0.099999999 which fails the fix you suggested.
Bernard.Mangay< fc **** @ googlemail.comwrote：
Bernard.Mangay <fc****@googlemail.comwrote:
由于舍入错误，余数不为零。如何删除
舍入错误？
The remainder is non zero due to rounding errors. How can I remove the
rounding errors?
如果你想要准确表示
这样的数字，请使用小数而不是双倍。
请参阅 http://pobox.com/~skeet/csharp/floatingpoint。 html 更多
信息。
-
Jon Skeet - < sk *** @ pobox .com>
网站： http：//www.pobox .com / ~siget
博客： http ：//www.msmvps.com/jon.skeet
C＃深度： http://csharpindepth.com
Use decimal instead of double if you want accurate representations of
numbers like this.
See http://pobox.com/~skeet/csharp/floatingpoint.html for more
information.
--
Jon Skeet - <sk***@pobox.com>
Web site: http://www.pobox.com/~skeet
Blog: http://www.msmvps.com/jon.skeet
C# in Depth: http://csharpindepth.com
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