# ilogb

< c‎ | numeric‎ | math

C
 Linguagem Digite apoio Gerenciamento de memória dinâmica De tratamento de erros Utilidades do programa Utilitários de data e hora Biblioteca cordas Algoritmos Numéricos Entrada / saída de apoio Suporte de localização Apoio discussão (C11) Operações atômicas (C11)

Funções matemáticas comuns
Funções
Original:
Functions
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Operações básicas
Original:
Basic operations
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 abslabsllabsimaxabs (C99)
 fabs
 divldivlldivimaxdiv (C99)
 fmod
 remainder (C99)
 remquo (C99)
 fma (C99)
 fmax (C99)
 fmin (C99)
 fdim (C99)
 nannanfnanl (C99)(C99)(C99)
Funções exponenciais
Original:
Exponential functions
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 exp
 exp2 (C99)
 expm1 (C99)
 log
 log10
 log1p (C99)
 log2 (C99)
Funções de poder
Original:
Power functions
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 sqrt
 cbrt (C99)
 hypot (C99)
 pow
Funções trigonométricas e hiperbólicas
Original:
Trigonometric and hyperbolic functions
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 sin
 cos
 tan
 asin
 acos
 atan
 atan2
 sinh
 cosh
 tanh
 asinh (C99)
 acosh (C99)
 atanh (C99)
Erro e funções gamma
Original:
Error and gamma functions
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 erf (C99)
 erfc (C99)
 lgamma (C99)
 tgamma (C99)
Número inteiro mais próximo de operações de ponto flutuante
Original:
Nearest integer floating point operations
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 ceil
 floor
 roundlroundllround (C99)(C99)(C99)
 trunc (C99)
 nearbyint (C99)
 rintlrintllrint (C99)(C99)(C99)
Flutuando funções de manipulação de pontos
Original:
Floating point manipulation functions
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 ldexp
 scalbnscalbln (C99)(C99)
 ilogb (C99)
 logb (C99)
 frexp
 modf
 nextafternexttoward (C99)(C99)
 copysign (C99)
Classificação
Original:
Classification
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 fpclassify (C99)
 isfinite (C99)
 isinf (C99)
 isnan (C99)
 isnormal (C99)
 signbit (C99)
Constantes de macros
Original:
Macro constants
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 HUGE_VALFHUGE_VALHUGE_VALL (C99)(C99)
 FP_NORMALFP_SUBNORMALFP_ZEROFP_INFINITEFP_NAN (C99)(C99)(C99)(C99)(C99)

 Definido no cabeçalho int ilogbf( float arg ); int ilogb( double arg ); int ilogbl( long double arg ); #define FP_ILOGB0 /*implementation-defined*/ #define FP_ILOGBNAN /*implementation-defined*/
Extrai o valor do expoente da arg argumento de ponto flutuante, e retorna como um valor inteiro assinado. Formalmente, o resultado é a parte inteira do log
r
|arg|
como um valor assinado integral, para não-zero arg, onde é r FLT_RADIX.
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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## Índice

### [editar]Parâmetros

 arg - flutuando valor de pontoOriginal: floating point valueThe text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

### [editar]Valor de retorno

O expoente de ponto flutuante, molde para inteiro.
Original:
The floating-point exponent, cast to integer.
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Erro domínio ou intervalo pode ocorrer se arg é zero, FP_ILOGB0 é retornado, nesse caso,.
Original:
Domain or range error may occur if arg is zero, FP_ILOGB0 is returned in that case.
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Erro de domínio ou intervalo pode ocorrer se arg é infinito, MAX_INT é devolvido em caso.
Original:
Domain or range error may occur if arg is infinite, MAX_INT is returned in that case.
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Erro de domínio ou intervalo pode ocorrer se arg é NaN, FP_ILOGBNAN é devolvido em caso.
Original:
Domain or range error may occur if arg is NaN, FP_ILOGBNAN is returned in that case.
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Original:
If the result cannot be represented as int, the result is undefined.
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### [editar]Notas

O valor do expoente retornado por ilogb é sempre 1 a menos do que o expoente retuned frexp por causa das exigências de normalização diferentes: para o expoente e retornado por ilogb, |arg*r-e
|
está entre 1 e r (tipicamente entre 1 e 2), mas para o expoente e retornado por frexp, |arg*2-e
|
é entre 0.5 e 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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