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ilogb

提供: cppreference.com
< c‎ | numeric‎ | math

 
 
 
一般的な数学関数
機能します
Original:
Functions
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基本操作
Original:
Basic operations
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remainder(C99)
remquo(C99)
fma(C99)
fmax(C99)
fmin(C99)
fdim(C99)
nan
nanf
nanl
(C99)
(C99)
(C99)
指数関数
Original:
Exponential functions
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exp
exp2(C99)
expm1(C99)
log
log10
log1p(C99)
log2(C99)
電源機能
Original:
Power functions
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sqrt
cbrt(C99)
hypot(C99)
pow
三角関数や双曲線関数
Original:
Trigonometric and hyperbolic functions
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sinh
cosh
tanh
asinh(C99)
acosh(C99)
atanh(C99)
エラーおよびガンマ関数
Original:
Error and gamma functions
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erf(C99)
erfc(C99)
lgamma(C99)
tgamma(C99)
最も近い整数の浮動小数点演算
Original:
Nearest integer floating point operations
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ceil
floor
round
lround
llround
(C99)
(C99)
(C99)
trunc(C99)
nearbyint(C99)
rint
lrint
llrint
(C99)
(C99)
(C99)
点操作関数に浮かぶ
Original:
Floating point manipulation functions
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ldexp
scalbn
scalbln
(C99)
(C99)
ilogb(C99)
logb(C99)
分類
Original:
Classification
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fpclassify(C99)
isfinite(C99)
isinf(C99)
isnan(C99)
isnormal(C99)
signbit(C99)
マクロ定数
Original:
Macro constants
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Defined in header <math.h>
int ilogbf( float arg );
int ilogb( double arg );
int ilogbl( long double arg );
#define FP_ILOGB0 /*implementation-defined*/
#define FP_ILOGBNAN /*implementation-defined*/
浮動小数点引数argから指数の値を抽出し、符号付き整数値として返します。正式には、結果はlog
r
|arg|
rある非ゼロの引数のために、符号付き整数値としてFLT_RADIXの不可欠な部分です.
Original:
Extracts the value of the exponent from the floating-point argument arg, and returns it as a signed integer value. Formally, the result is the integral part of log
r
|arg|
as a signed integral value, for non-zero arg, where r is FLT_RADIX.
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目次

[編集] パラメータ

arg -
浮動小数点値
Original:
floating point value
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[編集] 値を返します

整数にキャスト浮動小数点指数、.
Original:
The floating-point exponent, cast to integer.
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argがゼロの場合は領域エラーまたは範囲エラーが発生する可能性があり、FP_ILOGB0はその場合に返されます.
Original:
Domain or range error may occur if arg is zero, FP_ILOGB0 is returned in that case.
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argが無限大である場合、ドメインエラーまたは範囲エラーが発生する可能性があり、MAX_INTはその場合に返されます.
Original:
Domain or range error may occur if arg is infinite, MAX_INT is returned in that case.
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argがNaNの場合は領域エラーまたは範囲エラーが発生する可能性があり、FP_ILOGBNANはその場合に返されます.
Original:
Domain or range error may occur if arg is NaN, FP_ILOGBNAN is returned in that case.
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結果はintとして表すことができない場合、結果は未定義です.
Original:
If the result cannot be represented as int, the result is undefined.
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[編集] ノート

ilogbによって返さ指数frexpため、e、1〜ilogb(通常|arg*r-e
|
r)、しかしのために:1によって返される指数の値は、常に異なるため、正規化要件の2によって再び調整指数が1未満である指数部がefrexpによって返さ|arg*2-e
|
です0.51.
Original:
The value of the exponent returned by ilogb is always 1 less than the exponent retuned by frexp because of the different normalization requirements: for the exponent e returned by ilogb, |arg*r-e
|
is between 1 and r (typically between 1 and 2), but for the exponent e returned by frexp, |arg*2-e
|
is between 0.5 and 1.
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[編集]

[編集] も参照してください

数値は仮数と2の力に分解する
Original:
decomposes a number into significand and a power of 2
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(機能) [edit]
(C99)
数値の指数を抽出します
Original:
extracts exponent of the number
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(機能) [edit]
(C99)
(C99)
累乗しFLT_RADIXによって数を乗算します
Original:
multiplies a number by FLT_RADIX raised to a power
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(機能) [edit]