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log2

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< c‎ | numeric‎ | math

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C
 
Numeri
 
Comuni funzioni matematiche
Funzioni
Original:
Functions
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Operazioni di base
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Basic operations
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remainder(C99)
remquo(C99)
fma(C99)
fmax(C99)
fmin(C99)
fdim(C99)
nan
nanf
nanl		(C99)
(C99)
(C99)
Funzioni esponenziali
Original:
Exponential functions
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exp
exp2(C99)
expm1(C99)
log
log10
log1p(C99)
log2(C99)
Funzioni di risparmio energia
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Power functions
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sqrt
cbrt(C99)
hypot(C99)
pow
Funzioni trigonometriche e iperboliche
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Trigonometric and hyperbolic functions
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sinh
cosh
tanh
asinh(C99)
acosh(C99)
atanh(C99)
Errore e gamma funzioni
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Error and gamma functions
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erf(C99)
erfc(C99)
lgamma(C99)
tgamma(C99)
Più vicini operazioni di interi in virgola mobile
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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)
Floating funzioni di manipolazione di punti
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Floating point manipulation functions
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ldexp
scalbn
scalbln		(C99)
(C99)
ilogb(C99)
logb(C99)
Classificazione
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Classification
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fpclassify(C99)
isfinite(C99)
isinf(C99)
isnan(C99)
isnormal(C99)
signbit(C99)
Macro costanti
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Macro constants
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Elemento definito nell'header <math.h>
float       log2f( float arg );
double      log2( double arg );
long double log2l( long double arg );
Calcola la base 2 logaritmo arg.
Original:
Computes the base 2 logarithm of arg.
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[modifica] Parametri

arg -
valore in virgola mobile
Original:
floating point value
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[modifica] Valore di ritorno

log
2(arg)

Errore di dominio si verifica se arg è negativo. NAN viene restituito in questo caso.
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Domain error occurs if arg is negative. NAN is returned in that case.
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Campo errore si verifica se è arg ​0​. -HUGE_VAL viene restituito in questo caso.
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Range error occurs if arg is ​0​. -HUGE_VAL is returned in that case.
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[modifica] Vedi anche
calcola naturale (base e) logaritmo (alla base e) (ln(x))
Original:
computes natural (base e) logarithm (to base e) (ln(x))
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(funzione) [modifica]
calcola comune (base 10) logaritmo (log10(x))
Original:
computes common (base 10) logarithm (log10(x))
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(funzione) [modifica]
C++ documentation for log2
Estratto da "https://it.cppreference.com/mwiki/index.php?title=c/numeric/math/log2&oldid=24735"