MATH_ERRNO, MATH_ERREXCEPT, math_errhandling

 

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In fase di compilazione aritmetica razionale(C++11)

Generici operazioni numeriche Original: Generic numeric operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

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Comuni funzioni matematiche

Funzioni Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Operazioni di 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(int) labs llabs imaxabs (C++11) abs(float) fabs div ldiv lldiv imaxdiv (C++11) fmod	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 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 (C++11) expm1 (C++11)	log log10 log1p (C++11) log2 (C++11)
Funzioni di risparmio energia 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 (C++11)	hypot (C++11) pow
Funzioni trigonometriche e iperboliche 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 (C++11) acosh (C++11) atanh (C++11)

Errore e gamma funzioni 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 (C++11) erfc (C++11)	lgamma (C++11) tgamma (C++11)
Più vicini operazioni di interi in virgola mobile 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 (C++11) (C++11) (C++11)	trunc (C++11) nearbyint (C++11) rint lrint llrint (C++11) (C++11) (C++11)
Floating funzioni di manipolazione di punti 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 (C++11) (C++11) ilogb (C++11) logb (C++11)	frexp modf nextafter nexttoward (C++11) (C++11) copysign (C++11)
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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 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 (C++11) (C++11) INFINITY (C++11) NAN (C++11) math_errhandling MATH_ERRNO MATH_ERREXCEPT (C++11)	FP_NORMAL FP_SUBNORMAL FP_ZERO FP_INFINITE FP_NAN (C++11) (C++11) (C++11) (C++11) (C++11)

 

Elemento definito nell'header <cmath>
#define MATH_ERRNO        1		(dal C++11)
#define MATH_ERREXCEPT    2		(dal C++11)
#define math_errhandling  /*implementation defined*/		(dal C++11)

Il math_errhandling macro costante espande un'espressione di tipo int che è o uguale MATH_ERRNO, o uguale a MATH_ERREXCEPT, o pari alla loro OR bit a bit (MATH_ERRNO | MATH_ERREXCEPT).

Original:

The macro constant math_errhandling expands to an expression of type int that is either equal to MATH_ERRNO, or equal to MATH_ERREXCEPT, or equal to their bitwise OR (MATH_ERRNO | MATH_ERREXCEPT).

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Il valore math_errhandling indica il tipo di gestione degli errori che è eseguita dai virgola mobile operatori e funzioni:

Original:

The value of math_errhandling indicates the type of error handling that is performed by the floating-point operators and functions:

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Constant Original: Constant The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Explanation
MATH_ERREXCEPT	indica che eccezioni a virgola mobile vengono utilizzati: almeno FE_DIVBYZERO, FE_INVALID e FE_OVERFLOW sono definiti in <cfenv> . Original: indicates that floating-point exceptions are used: at least FE_DIVBYZERO, FE_INVALID, and FE_OVERFLOW are defined in <cfenv>. The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
MATH_ERRNO	indica che le operazioni in virgola mobile utilizzare il errno variabile per segnalare errori . Original: indicates that floating-point operations use the variable errno to report errors. The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

I seguenti virgola mobile condizioni di errore sono riconosciuti:

Original:

The following floating-point error conditions are recognized:

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Error Domain # (argomento di input è compreso nell'intervallo in cui l'operazione è matematicamente definita, ad esempio std::sqrt(-1), std::log(-1), o std::acos(2)). Se il bit è impostato MATH_ERRNO, EDOM viene assegnato a errno. Se il bit è impostato MATH_ERREXCEPT, FE_INVALID viene generato.

Original:

# Domain error (input argument is outside the range in which the operation is mathematically defined, e.g. std::sqrt(-1), std::log(-1), or std::acos(2)). If MATH_ERRNO bit is set, EDOM is assigned to errno. If MATH_ERREXCEPT bit is set, FE_INVALID is raised.

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# Errore di area (il risultato matematico non può essere rappresentato come oggetto di tipo specificato, ad esempio std::atanh(-1), std::log(0.0) o std::lgamma(0.0)). Se il bit è impostato MATH_ERRNO, ERANGE viene assegnato a errno. Se il bit è impostato MATH_ERREXCEPT, FE_DIVBYZERO o FE_OVERFLOW viene generato.

Original:

# Range error (the mathematical result cannot be represented as the object of specified type, e.g. std::atanh(-1), std::log(0.0), or std::lgamma(0.0)). If MATH_ERRNO bit is set, ERANGE is assigned to errno. If MATH_ERREXCEPT bit is set, FE_DIVBYZERO or FE_OVERFLOW is raised.

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# Overflow (il risultato matematico è finito, ma troppo grande per essere rappresentato senza errore di arrotondamento estremo, ad esempio funzioni come std::exp con argomenti sufficientemente grandi). Se il bit è impostato MATH_ERRNO, ERANGE viene assegnato a errno. Se il bit è impostato MATH_ERREXCEPT, FE_OVERFLOW viene generato.

Original:

# Overflow (the mathematical result is finite, but too big to be represented without extreme roundoff error, e.g. functions such as std::exp with sufficiently large arguments). If MATH_ERRNO bit is set, ERANGE is assigned to errno. If MATH_ERREXCEPT bit is set, FE_OVERFLOW is raised.

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# Underflow (il risultato matematico è diverso da zero, ma troppo piccolo per essere rappresentato senza errore di arrotondamento estrema, ad esempio, il risultato è subnormale, come in std::sin(subnormal) o per molte altre funzioni con argomenti subnormali). Se il bit è impostato MATH_ERRNO, ERANGE può essere assegnato a errno. Se il bit è impostato MATH_ERREXCEPT, FE_UNDERFLOW può essere sollevata.

Original:

# Underflow (the mathematical result is non-zero, but too small to be represented without extreme roundoff error, e.g. the result is subnormal, as in std::sin(subnormal) or for many other functions with subnormal arguments). If MATH_ERRNO bit is set, ERANGE may be assigned to errno. If MATH_ERREXCEPT bit is set, FE_UNDERFLOW may be raised.

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Vedi anche

FE_ALL_EXCEPT FE_DIVBYZERO FE_INEXACT FE_INVALID FE_OVERFLOW FE_UNDERFLOW (C++11)	eccezioni a virgola mobile Original: floating-point exceptions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (macro costante)
errno	macro che si espande a POSIX thread locale variable (variabili macro) Numero di errore Original: macro which expands to POSIX-compatible thread-local error number variable (variabili macro) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.