Espaços nominais
Variantes
Acções

ilogb

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< c‎ | numeric‎ | math

 
 
 
Funções matemáticas comuns
Funções
Original:
Functions
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Operações básicas
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)
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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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
round
lround
llround
(C99)
(C99)
(C99)
trunc(C99)
nearbyint(C99)
rint
lrint
llrint
(C99)
(C99)
(C99)
Flutuando funções de manipulação de pontos
Original:
Floating point manipulation functions
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ldexp
scalbn
scalbln
(C99)
(C99)
ilogb(C99)
logb(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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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*/
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 ponto
Original:
floating point value
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[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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Se o resultado não pode ser representado como int, o resultado é indefinido.
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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[editar] 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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(função) [edit]
(C99)
extrai expoente do número
Original:
extracts exponent of the number
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(função) [edit]
(C99)
(C99)
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]