std::abs(int), std::labs, std::llabs, std::imaxabs

 

C++

语言

概念

实用工具库

字符串库

集装箱库

算法库

迭代器库

Numerics库

输入/输出库

本地化库

正则表达式库 （C++11）

原子操作库 （C++11）

线程的支持库 （C++11）

 

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 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 <cstdlib>
int       abs( int n );
long      abs( long n );
long long abs( long long n );		（C++11 起）
long       labs( long n );
long long llabs( long long n );		（C++11 起）
Defined in header <cinttypes>
std::intmax_t abs( std::intmax_t n );		（C++11 起）
std::intmax_t imaxabs( std::intmax_t n );		（C++11 起）

计算一个整数的绝对值.

Original:

Computes the absolute value of an integer number.

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参数

n

-

整数值 Original: 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

的绝对值n（即|n|）

Original:

the absolute value of n (i.e. |n|)

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另请参阅

abs(float) fabs	一个浮点值的绝对值（|x|） Original: absolute value of a floating point value (|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）
abs(std::complex)	返回一个复数的幅度 Original: returns the magnitude of 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）
abs(std::valarray)	std::absvalarray的每个元素的功能 Original: applies the function std::abs to each element of valarray 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）