log

 

C

Langue

Tapez soutien

La gestion dynamique de la mémoire

Erreur de manipulation

Programme des services publics

Utilitaires date et l'heure

Bibliothèque cordes

Algorithmes

Numerics

D'entrée / sortie de support

Support de localisation

Le support des threads (C11)

Les opérations atomiques (C11)

 

Numerics

Fonctions mathématiques courantes

Virgule flottante environnement

Complex number arithmetics

Génération de nombres aléatoires

Type générique mathématiques

 

Fonctions mathématiques courantes

Fonctions Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Opérations de base 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.
abs labs llabs imaxabs (C99) fabs div ldiv lldiv imaxdiv (C99) fmod	remainder (C99) remquo (C99) fma (C99) fmax (C99) fmin (C99) fdim (C99) nan nanf nanl (C99) (C99) (C99)
Les fonctions exponentielles 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)
Les fonctions de puissance 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
Les fonctions trigonométriques et hyperboliques 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)
Erreur fonctions et gamma 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)
Entier le plus proche opérations en virgule flottante 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 round lround llround (C99) (C99) (C99)	trunc (C99) nearbyint (C99) rint lrint llrint (C99) (C99) (C99)
Flottant fonctions de manipulation de points 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 scalbn scalbln (C99) (C99) ilogb (C99) logb (C99)	frexp modf nextafter nexttoward (C99) (C99) copysign (C99)
Classification 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)
Macro constantes 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_VALF HUGE_VAL HUGE_VALL (C99) (C99)	FP_NORMAL FP_SUBNORMAL FP_ZERO FP_INFINITE FP_NAN (C99) (C99) (C99) (C99) (C99)

 

Déclaré dans l'en-tête <math.h>
float       logf(float arg );
double      log(double arg );
longdouble logl(longdouble arg );

Calcule le naturel (base e) logarithme de arg .

Original:

Computes the natural (base e) logarithm of arg.

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Paramètres

arg

-

valeur du point flottant 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.

Retourne la valeur

Natural logarithm of arg.

Erreur de domaine se produit si arg est négatif. NAN est retourné dans ce cas .

Original:

Domain error occurs if arg is negative. NAN is returned in that case.

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Erreur d'intervalle se produit si arg est ​0​. -HUGE_VAL est retourné dans ce cas .

Original:

Range error occurs if arg is ​0​. -HUGE_VAL is returned in that case.

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Voir aussi

exp	retours e à la puissance donnée (ex) Original: returns e raised to the given power (ex) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction)
log10	calcule commune (base 10) Logarithme (log10(x)) Original: computes common (base 10) logarithm (log10(x)) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction)
pow	soulève un certain nombre à la puissance donnée (xy) Original: raises a number to the given power (xy) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction)
C++ documentation for log