ilogb

 

C

言語

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動的なメモリ管理

エラー処理

プログラムユーティリティ

日付と時間のユーティリティ

ストリングスライブラリ

アルゴリズム

ニューメリック

入力/出力をサポートしています

ローカリゼーションサポート

スレッドのサポート (C11)

アトミック操作 (C11)

 

ニューメリック

一般的な数学関数

浮動小数点環境

Complex number arithmetics

乱数生成

型汎用数学

 

一般的な数学関数

機能します 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 labs llabs imaxabs (C99) fabs div ldiv lldiv imaxdiv (C99) fmod	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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
exp exp2 (C99) expm1 (C99)	log log10 log1p (C99) log2 (C99)
電源機能 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 (C99)	hypot (C99) pow
三角関数や双曲線関数 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 (C99) acosh (C99) atanh (C99)
エラーおよびガンマ関数 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 (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 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 (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 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 (C99) (C99) ilogb (C99) logb (C99)	frexp modf nextafter nexttoward (C99) (C99) copysign (C99)
分類 Original: Classification The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
fpclassify (C99)
isfinite (C99)
isinf (C99)
isnan (C99)
isnormal (C99)
signbit (C99)
マクロ定数 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 (C99) (C99)	FP_NORMAL FP_SUBNORMAL FP_ZERO FP_INFINITE FP_NAN (C99) (C99) (C99) (C99) (C99)

 

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|が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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パラメータ

arg

-

浮動小数点値 Original: 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.

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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ノート

ilogbによって返さ指数frexpため、e、1〜ilogb（通常|arg*r-e
|間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0.5間1.

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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も参照してください

frexp	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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数)
logb (C99)	数値の指数を抽出します Original: extracts exponent of the number The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数)
scalbn scalbln (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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数)
C++ documentation for ilogb