Espaços nominais
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logb

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< c‎ | numeric‎ | math

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C
 
Numéricos
 
Funções matemáticas comuns
Funções
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Functions
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Operações básicas
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Basic operations
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Funções exponenciais
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Exponential functions
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Funções de poder
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Power functions
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Funções trigonométricas e hiperbólicas
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Trigonometric and hyperbolic functions
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Erro e funções gamma
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Error and gamma functions
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Número inteiro mais próximo de operações de ponto flutuante
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Nearest integer floating point operations
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Flutuando funções de manipulação de pontos
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Floating point manipulation functions
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logb
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Classificação
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Classification
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Constantes de macros
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Macro constants
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Definido no cabeçalho <math.h>
float       logbf( float arg );
double      logb( double arg );
long double logbl( long double arg );
Extrai o valor do expoente da arg argumento de ponto flutuante, e devolve-lo como um valor de ponto flutuante. Formalmente, o resultado é a parte integrante da log
r|arg| como um assinado valor de ponto flutuante, para os não-zero arg, onde r é FLT_RADIX. Se arg é subnormal, ele é tratado como se fosse normalizada.
Original:
Extracts the value of the exponent from the floating-point argument arg, and returns it as a floating-point value. Formally, the result is the integral part of log
r|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.
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Índice

[editar] Parâmetros

arg -
flutuando valor de ponto
Original:
floating point value
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[editar] Valor de retorno

O expoente de ponto flutuante.
Original:
The floating-point exponent.
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Erro de domínio ou intervalo pode ocorrer se arg é zero.
Original:
Domain or range error may occur if arg is zero.
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[editar] Notas

O valor do expoente retornado por logb é sempre 1 a menos do que o expoente retuned frexp por causa das exigências de normalização diferentes: para o expoente e retornado por logb, |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 logb is always 1 less than the exponent retuned by frexp because of the different normalization requirements: for the exponent 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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[editar] Exemplo

Esta seção está incompleta
Motivo: sem exemplo

[editar] Veja também
decompõe um número em significand e um poder de 2
Original:
decomposes a number into significand and a power of 2
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extrai expoente do número
Original:
extracts exponent of the number
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(função) [edit]
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multiplica um número por FLT_RADIX elevado a uma potência
Original:
multiplies a number by FLT_RADIX raised to a power
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(função) [edit]
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