如何获得的实行最大precision浮点数据类型和printf的说明？ [英] How to get the largest precision floating point data type of implemenation and its printf specifier?
问题描述
或者换句话说，是否有等同还会将intmax_t 和％JD 但对于浮点数？
Or put differently, are there equivalents to intmax_t and %jd but for floating point numbers?
这已经被问，这里侧问题，但问题是如此之大，我认为人们忘了回答边问题。也被标记为C ++和我正在寻找一个C的解决方案。
This has already been asked as a side question here, but the question is so large that I think people forgot to answer the side question. Also that was tagged as c++, and I'm looking for a c solution.
相关问题：
- float & double in C99
推荐答案
C11不具有浮点当量将intmax_t（与支持的最大宽度整数类型）。如果未来的Ç定义某种长长double等语言presently没有无缝升级路径。
C11 does not have a floating point equivalents to intmax_t (Integer type with the maximum width supported.). Should C of the future define some sort of long long double, etc. the language presently has no seamless upgrade path to it.
C11 6.11.1.1未来标准化可包括附加的浮点类型，包括那些具有更大的范围，precision或两者比长一倍。确实指向你预想更大的宽度的可能性。
C11 6.11.1.1 "Future standardization may include additional floating-point types, including those with greater range, precision, or both than long double." does point to the possibility of larger widths you envision.
有浮点数的情况有所不同，从有需要的整数。各种处理器多年来（8,16,32,64）和128在地平线上有越来越宽整数宽度。而总浮点的规模已的相对的更稳定（4,8,10,16），precision，范围，编码，四舍五入已经采取了很多FP关心。我怀疑我们将看到一个小数和二进制浮点规范。
The situation for floating-point numbers differs from integers in need. Various processors have had increasingly width integer widths over the years (8,16,32,64) and 128 on the horizon. Whereas gross floating-point size has been relatively more stable (4,8,10,16) , precision, range, encoding, rounding have taken up much FP concern. I suspect we'll see decimal and binary floating point specifications next.
另一个区别是整数生长在一个维度 - 范围。 FP可在范围和precision独立生长，更不用说基地（2，10，16等）的特殊性另请参见IEEE 754的评论。
Another difference is that integers grow in one dimension - range. FP can grow independently in range and precision, not to mention the peculiarities of base (2, 10, 16, etc.) Also see "IEEE 754" comment below.
presently我们有3个：C11 6.2.5.4：浮动，双击和长双。如果你想创建你可以prepare与发言权的变化正向兼容路径的typedef长双Xdouble ，但你可能不得不写了很多包装的像功能 Xdouble氮化硅（Xdouble X）; ，prepare许多相当于定义了 DBL_MANT_DIG ， PRIdN 等不小的功夫。
Presently we have 3: C11 6.2.5.4 : float, double, and long double. Should you want to create a forward compatibly path you could prepare for a change with say typedef long double Xdouble, but then you may be obliged to write a lot of wrapper functions like Xdouble sinX(Xdouble x);, prepare many equivalent defines to DBL_MANT_DIG, PRIdN, etc. No small effort.
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