std::abs<div class="t-tr-text">（浮动）<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(float)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>, std::fabs

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C++
 
Numerics的圖書館
常見的數學函數
浮點環境
複數
數字陣列
偽隨機數生成
編譯時合理的演算法 （C++11）
通用的數值運算
Original:
Generic numeric operations
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iota（C++11）
accumulate
inner_product
adjacent_difference
partial_sum
 
常見的數學函數
功能
Original:
Functions
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基本操作
Original:
Basic operations
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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）
指數函數
Original:
Exponential functions
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exp
exp2（C++11）
expm1（C++11）
log
log10
log1p（C++11）
log2（C++11）
電源的功能
Original:
Power functions
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sqrt
cbrt（C++11）
hypot（C++11）
pow
三角函數和雙曲功能
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Trigonometric and hyperbolic functions
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sinh
cosh
tanh
asinh（C++11）
acosh（C++11）
atanh（C++11）
錯誤和伽瑪功能
Original:
Error and gamma functions
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erf（C++11）
erfc（C++11）
lgamma（C++11）
tgamma（C++11）
最接近的整數，浮點運算
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Nearest integer floating point operations
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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）
浮點操作功能
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Floating point manipulation functions
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ldexp
scalbn
scalbln		（C++11）
（C++11）
ilogb（C++11）
logb（C++11）
frexp
modf
nextafter
nexttoward		（C++11）
（C++11）
copysign（C++11）
分類/比較
Original:
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
Original:
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>
float       abs( float arg );
double      abs( double arg );
long double abs( long double arg );
float       fabs( float arg );
double      fabs( double arg );
long double fabs( long double arg );
double      fabs( Integral arg );
 （C++11 起）
計算一個浮點值的絕對值arg.
Original:
Computes the absolute value of a floating point value arg.
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[编辑] 參數

arg -
浮點值
Original:
floating point value
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[编辑] 返回值

的絕對值arg（|arg|）
Original:
the absolute value of arg (|arg|)
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[编辑] 另請參閱




（C++11）
計算的積分值（|x|）的絕對值
Original:
computes absolute value of an integral value (|x|)
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（函數） [edit]
（C++11）
給定數量的檢查，如果是否定的
Original:
checks if the given number is negative
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（函數） [edit]
返回一個複數的幅度
Original:
returns the magnitude of a complex number
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（函數模板） [edit]
std::absvalarray的每個元素的功能
Original:
applies the function std::abs to each element of valarray
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（函數模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/numeric/math/fabs&oldid=29033”