logb
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| Defined in header <math.h>
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| float logbf( float arg ); |
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| double logb( double arg ); |
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| long double logbl( long double arg ); |
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浮動小数点引数
r|arg|が
argから指数の値を抽出し、浮動小数点値として返します。 logr|arg|が
rです正式には、結果は、非ゼロの引数では、符号付き浮動小数点値としてFLT_RADIXの不可欠な部分です。 argが非正規の場合は、それが標準化したかのように扱われます.Original:
Extracts the value of the exponent from the floating-point argument
r|arg| as a signed floating-point value, for non-zero arg, where
arg, and returns it as a floating-point value. Formally, the result is the integral part of logr|arg| as a signed floating-point value, for non-zero arg, where
r is FLT_RADIX. If arg is subnormal, it is treated as though it was normalized.The text has been machine-translated via Google Translate.
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目次 |
[編集] 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. |
[編集] 値を返します
浮動小数点の指数.
Original:
The floating-point exponent.
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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ことがあります.Original:
Domain or range error may occur if
arg is zero.The text has been machine-translated via Google Translate.
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[編集] ノート
logbによって返さ指数frexpため、
|間
|です0.5間1.
e、1〜logb（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 logb is always 1 less than the exponent retuned by frexp because of the different normalization requirements: for the exponent
| is between 1 and
| is between 0.5 and 1.
e returned by logb, |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] 例
| This section is incomplete Reason: no example |
[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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (関数) | |
| (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) |
| (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) |
