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std::log2

Da cppreference.com.
< cpp‎ | numeric‎ | math

 
 
Numeri libreria
Comuni funzioni matematiche
Virgola mobile ambiente
I numeri complessi
Array numerici
Pseudo-casuale generazione
In fase di compilazione aritmetica razionale (C++11)
Generici operazioni numeriche
Original:
Generic numeric operations
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iota(C++11)
accumulate
inner_product
adjacent_difference
partial_sum
 
Comuni funzioni matematiche
Funzioni
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Functions
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Operazioni di base
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Basic operations
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remainder(C++11)
remquo(C++11)
fma(C++11)
fmax(C++11)
fmin(C++11)
fdim(C++11)
nan
nanf
nanl
(C++11)
(C++11)
(C++11)
Funzioni esponenziali
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Exponential functions
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exp
exp2(C++11)
expm1(C++11)
log
log10
log1p(C++11)
log2(C++11)
Funzioni di risparmio energia
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Power functions
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sqrt
cbrt(C++11)
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Trigonometric and hyperbolic functions
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sinh
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Errore e gamma funzioni
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Error and gamma functions
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erf(C++11)
erfc(C++11)
lgamma(C++11)
tgamma(C++11)
Più vicini operazioni di interi in virgola mobile
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Nearest integer floating point operations
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ceil
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rint
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Floating funzioni di manipolazione di punti
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Floating point manipulation functions
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ldexp
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(C++11)
(C++11)
ilogb(C++11)
logb(C++11)
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modf
nextafter
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copysign(C++11)
Classificazione / confronto
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Classification/Comparison
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fpclassify(C++11)
isfinite(C++11)
isinf(C++11)
isnan(C++11)
isnormal(C++11)
signbit(C++11)
isgreater(C++11)
isgreaterequal(C++11)
isless(C++11)
islessequal(C++11)
islessgreater(C++11)
isunordered(C++11)
Macro costanti
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Macro constants
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FP_NORMAL
FP_SUBNORMAL
FP_ZERO
FP_INFINITE
FP_NAN
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
 
Defined in header <cmath>
float       log2( float arg );
(dal C++11)
double      log2( double arg );
(dal C++11)
long double log2( long double arg );
(dal C++11)
double      log2( Integral arg );
(dal C++11)
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.
Original:
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.
Original:
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) [edit]
(C++11)
torna 2 elevato alla potenza data (2x)
Original:
returns 2 raised to the given power (2x)
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(funzione) [edit]
calcola comune (base 10) logaritmo (log10(x))
Original:
computes common (base 10) logarithm (log10(x))
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(funzione) [edit]