NAN
Defined in header <cmath> | | |
|---|---|---|
#define NAN /*implementation defined*/ | | (since C++11) |
宏NAN扩展为类型的常量表达式。float它的计算值为安静的非a-数字%28 QNaN%29值。如果实现不支持QNaNs，则不定义此宏常量。
注记
有许多不同的NaN值，根据它们的有效载荷和符号位来区分。由宏生成的有效载荷和符号位的内容。NAN是实现定义的。
另见
nannanfnanl (C++11)(C++11)(C++11) | not-a-number (NaN) (function) |
|---|---|
isnan (C++11) | checks if the given number is NaN (function) |
has_quiet_NaN static | identifies floating-point types that can represent the special value "quiet not-a-number" (NaN) (public static member constant of std::numeric_limits) |
has_signaling_NaN static | identifies floating-point types that can represent the special value "signaling not-a-number" (NaN) (public static member constant of std::numeric_limits) |
quiet_NaN static | returns a quiet NaN value of the given floating-point type (public static member function of std::numeric_limits) |
signaling_NaN static | returns a signaling NaN value of the given floating-point type (public static member function of std::numeric_limits) |
c NAN文件
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