logb

 

C

Lenguaje

Encabezados

Soporte de tipos

Utilidades del programa

Funciones variádicas

Gestión de errores

Gestión de memoria dinámica

Utilidades de fecha y hora

Biblioteca de cadenas de caracteres

Algoritmos

Números

Soporte de entrada/salida

Soporte de localización

Operaciones atómicas(C11)

Soporte de procesos(C11)

Especificaciones Técnicas

 

Números

Funciones matemáticas comunes

Entorno de coma flotante

Generación de números pseudo-aleatorios

Aritmética de números complejos

Matemáticas de tipo genérico

 

Funciones matemáticas comunes

Funciones Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Operaciones básicas 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.
abslabsllabsimaxabs (C99) fabs divldivlldivimaxdiv (C99) fmod	remainder (C99) remquo (C99) fma (C99) fmax (C99) fmin (C99) fdim (C99) nannanfnanl (C99)(C99)(C99)
Funciones exponenciales 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)
Funciones de energía 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
Funciones trigonométricas e hiperbólicas 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)
Error gamma y funciones 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)
Más cerca de las operaciones con enteros en coma flotante 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 roundlroundllround (C99)(C99)(C99)	trunc (C99) nearbyint (C99) rintlrintllrint (C99)(C99)(C99)
Funciones de punto flotante de manipulación 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 scalbnscalbln (C99)(C99) ilogb (C99) logb (C99)	frexp modf nextafternexttoward (C99)(C99) copysign (C99)
Clasificación 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)
Constantes Macro 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_VALFHUGE_VALHUGE_VALL (C99)(C99)	FP_NORMALFP_SUBNORMALFP_ZEROFP_INFINITEFP_NAN (C99)(C99)(C99)(C99)(C99)

 

Definido en el archivo de encabezado <math.h>
float       logbf(float arg );		(desde C99)
double      logb(double arg );		(desde C99)
longdouble logbl(longdouble arg );		(desde C99)

Extrae el valor del exponente de la arg argumento de punto flotante, y la devuelve como un valor de punto flotante. Formalmente, el resultado es la parte integral de log
r|arg| como firmado valor de punto flotante, para no-cero arg, donde r es FLT_RADIX. Si arg es subnormal, es tratado como si se normalizó .

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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Parámetros

arg

-

flotando valor en puntos 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.

Valor de retorno

El exponente de punto flotante .

Original:

The floating-point exponent.

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Error de dominio o rango puede ocurrir si arg es cero .

Original:

Domain or range error may occur if arg is zero.

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Notas

El valor del exponente devuelto por logb siempre es 1 menos que el exponente reajustada por frexp debido a los requisitos de normalización diferentes: para la e exponente devuelto por logb, |arg*r-e
| es entre 1 y r (típicamente entre 1 y 2), pero para la exponente e devuelto por frexp, |arg*2-e
| es entre 0.5 y 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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Ver también

frexp	se descompone un número en mantisa y una potencia de 2 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. (función)
ilogb (C99)	extrae exponente de la serie 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. (función)
scalbnscalbln (C99)(C99)	multiplica un número por FLT_RADIX elevado a una potencia 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. (función)