FE_DIVBYZERO, FE_INEXACT, FE_INVALID, FE_OVERFLOW, FE_UNDERFLOW, FE_ALL_EXCEPT
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Déclaré dans l'en-tête <cfenv> | ||
#define FE_DIVBYZERO /*implementation defined power of 2*/ | (depuis C++11) | |
#define FE_INEXACT /*implementation defined power of 2*/ | (depuis C++11) | |
#define FE_INVALID /*implementation defined power of 2*/ | (depuis C++11) | |
#define FE_OVERFLOW /*implementation defined power of 2*/ | (depuis C++11) | |
#define FE_UNDERFLOW /*implementation defined power of 2*/ | (depuis C++11) | |
#define FE_ALL_EXCEPT FE_DIVBYZERO | FE_INEXACT | \ FE_INVALID | FE_OVERFLOW | \ | (depuis C++11) | |
Toutes ces constantes macro (sauf FE_ALL_EXCEPT) à étendre entiers des expressions constantes qui sont des puissances de 2 distinctes, qui identifient de façon unique tous soutenus exceptions de virgule flottante. Chaque macro n'est définie que si elle est soutenue .
Original:
All these macro constants (except FE_ALL_EXCEPT) expand to integer constant expressions that are distinct powers of 2, which uniquely identify all supported floating-point exceptions. Each macro is only defined if it is supported.
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Le FE_ALL_EXCEPT macro constante, qui se développe pour un OU binaire de tous les
FE_* autre, est toujours définie et est nul si exceptions de virgule flottante ne sont pas pris en charge par la mise en œuvre .Original:
The macro constant FE_ALL_EXCEPT, which expands to the bitwise OR of all other
FE_*, is always defined and is zero if floating-point exceptions are not supported by the implementation.The text has been machine-translated via Google Translate.
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Constante 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 |
FE_DIVBYZERO | division par zéro s'est produite lors de l'opération précédente à virgule flottante Original: division by zero occurred during the earlier floating-point operation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
FE_INEXACT | inexactes résultat: l'arrondissement était nécessaire pour stocker le résultat de l'opération précédente à virgule flottante Original: inexact result: rounding was necessary to store the result of the earlier floating-point operation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
FE_INVALID | opération non valide: l'opération plus tôt à virgule flottante ne pouvait pas effectuée Original: invalid operation: the earlier floating-point operation could not performed The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
FE_OVERFLOW | le résultat de la première opération à virgule flottante était trop grand pour être représentable Original: the result of the earlier floating-point operation was too large to be representable The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
FE_UNDERFLOW | le résultat de l'opération précédente à virgule flottante était inférieure à la normale Original: the result of the earlier floating-point operation was subnormal The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
FE_ALL_EXCEPT | OU binaire entre toutes prises en charge exceptions de virgule flottante Original: bitwise OR of all supported 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. |
La mise en œuvre peut définir des constantes macro supplémentaires
<cfenv> pour identifier d'autres exceptions de virgule flottante. Tous ces constantes commencent par FE_ suivie d'au moins une lettre majuscule .Original:
The implementation may define additional macro constants in
<cfenv> to identify additional floating-point exceptions. All such constants begin with FE_ followed by at least one uppercase letter.The text has been machine-translated via Google Translate.
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[modifier]Exemple
#include <iostream>#include <cfenv>#include <cmath> #pragma STDC FENV_ACCESS ON volatiledouble zero =0.0;// volatile not needed where FENV_ACCESS is supportedvolatiledouble one =1.0;// volatile not needed where FENV_ACCESS is supported int main(){std::feclearexcept(FE_ALL_EXCEPT);std::cout<<"1.0/0.0 = "<<1.0/ zero <<'\n';if(std::fetestexcept(FE_DIVBYZERO)){std::cout<<"division by zero reported\n";}else{std::cout<<"divsion by zero not reported\n";} std::feclearexcept(FE_ALL_EXCEPT);std::cout<<"1.0/10 = "<< one/10<<'\n';if(std::fetestexcept(FE_INEXACT)){std::cout<<"inexact result reported\n";}else{std::cout<<"inexact result not reported\n";} std::feclearexcept(FE_ALL_EXCEPT);std::cout<<"sqrt(-1) = "<<std::sqrt(-1)<<'\n';if(std::fetestexcept(FE_INVALID)){std::cout<<"invalid result reported\n";}else{std::cout<<"invalid result not reported\n";}}
Résultat :
1.0/0.0 = inf division by zero reported 1.0/10 = 0.1 inexact result reported sqrt(-1) = -nan invalid result reported
[modifier]Voir aussi
(C++11) (C++11) (C++11) | définit le mécanisme de gestion des erreurs utilisée par les fonctions mathématiques courantes Original: defines the error handling mechanism used by the common mathematical functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (constante macro) |
