double的范围是否比long更大? [英] Does double have a greater range than long?

问题描述

在MSDN上的一篇文章中，它指出 double 数据类型的范围为"-1.79769313486232e308 .. 1.79769313486232e308".而 long 数据类型的范围仅为"-9,223,372,036,854,775,808 .. 9,223,372,036,854,775,807".如果 double 的大小均为64位，那么如何容纳比 long 长的数据呢?

In an article on MSDN, it states that the double data type has a range of "-1.79769313486232e308 .. 1.79769313486232e308". Whereas the long data type only has a range of "-9,223,372,036,854,775,808 .. 9,223,372,036,854,775,807". How can a double hold so much more data than a long if they are both 64 bits in size?

http://msdn.microsoft.com/en-us/library/cs7y5x0x(v=vs.90).aspx

推荐答案

可能加倍的数量和可能的多头数量相同，只是分配方式不同*.

The number of possible doubles, and the number of possible longs is the same, they are just distributed differently*.

多头是均匀分布的，而浮动则不是.您可以在此处了解更多信息.

The longs are uniformly distributed, while the floats are not. You can Read more here.

我会写更多，但由于某种原因，光标会在手机上的各处跳来跳去.

I'd write more, but for some reason the cursor is jumping around all over the place on my phone.

这实际上可能更有用: http://zh-CN.wikipedia.org/wiki/Double-precision_floating-point_format#section_1

This might actually be more helpful: http://en.wikipedia.org/wiki/Double-precision_floating-point_format#section_1

Edit2:甚至更好: http://blogs.msdn.com/b/dwayneneed/archive/2010/05/07/fun-with-floating-point.aspx

and this is even better: http://blogs.msdn.com/b/dwayneneed/archive/2010/05/07/fun-with-floating-point.aspx

* 根据该链接，实际上似乎有更多的long，因为由于NaN和其他特殊数字的表示方式，一些双精度数丢失了.

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