std::pow

 

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常见的数学函数

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编译时合理的算法 （C++11）

通用的数值运算 Original: Generic numeric operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iota （C++11）

accumulate

inner_product

adjacent_difference

partial_sum

 

常见的数学函数

功能 Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
基本操作 Original: Basic operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
abs(int) labs llabs imaxabs （C++11） abs(float) fabs div ldiv lldiv imaxdiv （C++11） fmod	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 Original: Exponential functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
exp exp2 （C++11） expm1 （C++11）	log log10 log1p （C++11） log2 （C++11）
电源的功能 Original: Power functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
sqrt cbrt （C++11）	hypot （C++11） pow
三角函数和双曲功能 Original: Trigonometric and hyperbolic functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
sin cos tan asin acos atan atan2	sinh cosh tanh asinh （C++11） acosh （C++11） atanh （C++11）

错误和伽玛功能 Original: Error and gamma functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
erf （C++11） erfc （C++11）	lgamma （C++11） tgamma （C++11）
最接近的整数，浮点运算 Original: Nearest integer floating point operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ceil floor round lround llround （C++11） （C++11） （C++11）	trunc （C++11） nearbyint （C++11） rint lrint llrint （C++11） （C++11） （C++11）
浮点操作功能 Original: Floating point manipulation functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ldexp scalbn scalbln （C++11） （C++11） ilogb （C++11） logb （C++11）	frexp modf nextafter nexttoward （C++11） （C++11） copysign （C++11）
分类/比较 Original: Classification/Comparison The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 Original: Macro constants The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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>
float       pow( float base, float exp );	(1)
double      pow( double base, double exp );	(2)
long double pow( long double base, long double exp );	(3)
Promoted    pow( Arithmetic base, Arithmetic exp );	(4)	（C++11 起）
float       pow( float base, int iexp );	(5)	（至 C++11）
double      pow( double base, int iexp );	(6)	（至 C++11）
long double pow( long double base, int iexp );	(7)	（至 C++11）

base次方计算值exp或iexp.

Original:

Computes the value of base raised to the power exp or iexp.

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4)

过载或一组函数模板的所有组合的算术类型的参数不包括1-3）。如果任何参数是整数类型，它被转换为double。如果任何参数是long double，则返回类型Promoted还long double，否则，返回类型总是double.

Original:

A set of overloads or a function template for all combinations of arguments of arithmetic type not covered by 1-3). If any argument has integral type, it is cast to double. If any argument is long double, then the return type Promoted is also long double, otherwise the return type is always double.

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参数

base	-	浮点值的基础 Original: base as floating point value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
exp	-	指数浮点值 Original: exponent as floating point value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
iexp	-	指数为整数值 Original: exponent as integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

返回值

base提出的功率（exp或iexp）

Original:

base raised by power (exp or iexp).

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域错误当base是0和exp是小于或等于​0​。 NAN是在这种情况下，返回.

Original:

Domain error occurs if base is 0 and exp is less than or equal to ​0​. NAN is returned in that case.

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域发生错误，如果base是负的且exp不是一个整数的值。 NAN是在这种情况下，返回.

Original:

Domain error occurs if base is negative and exp is not an integer value. NAN is returned in that case.

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范围错误发生，如果发生溢出。 HUGEVAL是在这种情况下，返回.

Original:

Range error occurs if an overflow takes place. HUGEVAL is returned in that case.

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注释

pow(float, int)回报float，直到C + +11（过载），但返回double因为C + +11（过载）

Original:

pow(float, int) returns float until C++11 (per overload 5) but returns double since C++11 (per overload 4)

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另请参阅

exp	返回“E”提出的功率（ex） Original: returns e raised to the given power (ex) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数）
log	计算自然（基地“E”）对数（基地“E”）（ln(x)） Original: computes natural (base e) logarithm (to base e) (ln(x)) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数）
sqrt	计算平方根（√x） Original: computes square root (√x) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数）
cbrt （C++11）	计算立方米的根（3√x） Original: computes cubic root (3√x) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数）
pow(std::complex)	复杂的电源，一个或这两个参数可以是复数 Original: complex power, one or both arguments may be a complex number The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）
pow(std::valarray)	适用的功能std::pow两个valarrays或valarray的和一个值 Original: applies the function std::pow to two valarrays or a valarray and a value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）