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log2

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< c‎ | numeric‎ | math

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C
 
Numéricos
 
Funções matemáticas comuns
Funções
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Functions
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Operações básicas
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Basic operations
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Funções exponenciais
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Exponential functions
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Funções de poder
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Power functions
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Funções trigonométricas e hiperbólicas
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Trigonometric and hyperbolic functions
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Erro e funções gamma
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Error and gamma functions
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Número inteiro mais próximo de operações de ponto flutuante
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Nearest integer floating point operations
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Flutuando funções de manipulação de pontos
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Floating point manipulation functions
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Classificação
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Classification
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Constantes de macros
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Macro constants
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Definido no cabeçalho <math.h>
float       log2f( float arg );
double      log2( double arg );
long double log2l( long double arg );
Calcula o logaritmo de base 2 de arg.
Original:
Computes the base 2 logarithm of arg.
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[editar] Parâmetros

arg -
flutuando valor de ponto
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floating point value
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[editar] Valor de retorno

log
2(arg)

Erro de domínio ocorre se arg é negativo. NAN é devolvido em caso.
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Domain error occurs if arg is negative. NAN is returned in that case.
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Faixa de erro ocorre se arg é ​0​. -HUGE_VAL é devolvido em caso.
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Range error occurs if arg is ​0​. -HUGE_VAL is returned in that case.
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[editar] Veja também
calcula natural (base e) logaritmo (de base e) (ln(x))
Original:
computes natural (base e) logarithm (to base e) (ln(x))
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(função) [edit]
calcula comum (base 10) logaritmo (log10(x))
Original:
computes common (base 10) logarithm (log10(x))
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(função) [edit]
C++ documentation for log2
Obtida de "https://pt.cppreference.com/mwiki/index.php?title=c/numeric/math/log2&oldid=19715"