std::fpclassify

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C++
 
Numerics的图书馆
常见的数学函数
浮点环境
复数
数字阵列
伪随机数生成
编译时合理的算法 （C++11）
通用的数值运算
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Generic numeric operations
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iota（C++11）
accumulate
inner_product
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partial_sum
 
常见的数学函数
功能
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Functions
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基本操作
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Basic operations
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remainder（C++11）
remquo（C++11）
fma（C++11）
fmax（C++11）
fmin（C++11）
fdim（C++11）
nan
nanf
nanl		（C++11）
（C++11）
（C++11）
指数函数
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Exponential functions
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exp
exp2（C++11）
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log
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Power functions
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cbrt（C++11）
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Trigonometric and hyperbolic functions
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Nearest integer floating point operations
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Floating point manipulation functions
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copysign（C++11）
分类/比较
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Classification/Comparison
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fpclassify（C++11）
isfinite（C++11）
isinf（C++11）
isnan（C++11）
isnormal（C++11）
signbit（C++11）
isgreater（C++11）
isgreaterequal（C++11）
isless（C++11）
islessequal（C++11）
islessgreater（C++11）
isunordered（C++11）
宏常量
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Macro constants
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HUGE_VALF
HUGE_VAL
HUGE_VALL		（C++11）

（C++11）
INFINITY（C++11）
NAN（C++11）
math_errhandling
MATH_ERRNO
MATH_ERREXCEPT		（C++11）
FP_NORMAL
FP_SUBNORMAL
FP_ZERO
FP_INFINITE
FP_NAN		（C++11）
（C++11）
（C++11）
（C++11）
（C++11）
 
Defined in header <cmath>
int fpclassify( float arg );
 （C++11 起）
int fpclassify( double arg );
 （C++11 起）
int fpclassify( long double arg );
 （C++11 起）
分为以下几类：零，低于正常，正常的，无限的，NAN或实现定义的类别分类浮点值arg.
Original:
Categorizes floating point value arg into the following categories: zero, subnormal, normal, infinite, NAN, or implementation-defined category.
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[编辑] 参数

arg -
浮点值
Original:
floating point value
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[编辑] 返回值

FP_INFINITE，FP_NAN，FP_NORMAL，FP_SUBNORMAL，FP_ZERO或实现自定义类型，指定类别的arg.
Original:
one of FP_INFINITE, FP_NAN, FP_NORMAL, FP_SUBNORMAL, FP_ZERO or implementation-defined type, specifying the category of arg.
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[编辑] 另请参阅

（C++11）
如果给定数量的检查具有有限的价值
Original:
checks if the given number has finite value
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（函数） [edit]
（C++11）
检查，如果给定的数目是无限的
Original:
checks if the given number is infinite
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（函数） [edit]
（C++11）
检查，如果给定的数字为NaN
Original:
checks if the given number is NaN
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（函数） [edit]
（C++11）
检查如果给定的数字是正常的
Original:
checks if the given number is normal
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（函数） [edit]
提供了一个接口的所有基本数字类型的查询性能.
Original:
provides an interface to query properties of all fundamental numeric types.
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（类模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/numeric/math/fpclassify&oldid=29009”