Floating point environment
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L'environnement en virgule flottante est l'ensemble des indicateurs d'état à virgule flottante et des modes de contrôle pris en charge par l'application. Il est thread-local, chaque fil hérite de l'état initial de l'environnement à virgule flottante à partir du fil parent. Opérations en virgule flottante modifier les indicateurs d'état à virgule flottante pour indiquer les résultats anormaux ou de l'information auxiliaire. L'état des modes de contrôle à virgule flottante affecte les résultats de certaines opérations en virgule flottante .
Original:
The floating-point environment is the set of floating-point status flags and control modes supported by the implementation. It is thread-local, each thread inherits the initial state of its floating-point environment from the parent thread. Floating-point operations modify the floating-point status flags to indicate abnormal results or auxiliary information. The state of floating-point control modes affects the outcomes of some floating-point operations.
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L'accès à l'environnement en virgule flottante et la modification n'a de sens que lorsque
#pragma STDC FENV_ACCESS est réglé sur
ON. Sinon, la mise en œuvre est libre de penser que les modes de contrôle à virgule flottante sont toujours ceux par défaut et que les indicateurs d'état à virgule flottante ne sont jamais testés ou modifiés. Dans la pratique, rares sont les compilateurs actuels prennent en charge la #pragma explicitement, mais la plupart des compilateurs autorisent un accès significatif à l'environnement en virgule flottante de toute façon .Original:
The floating-point environment access and modification is only meaningful when
#pragma STDC FENV_ACCESS is set to
ON. Otherwise the implementation is free to assume that floating-point control modes are always the default ones and that floating-point status flags are never tested or modified. In practice, few current compilers support the #pragma explicitly, but most compilers allow meaningful access to the floating-point environment anyway.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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Types
Defined in header
<fenv.h> | |
fenv_t
|
Le type qui représente l'ensemble de la virgule flottante environnement
Original: The type representing the entire floating-point environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
fexcept_t
|
Le type représentant tous les indicateurs d'état à virgule flottante collectivement
Original: The type representing all floating-point status flags collectively The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Fonctions
(C99) |
efface les indicateurs d'état spécifiées à virgule flottante Original: clears the specified floating-point status flags The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) |
(C99) |
détermine quels sont les indicateurs spécifiés état à virgule flottante sont définies Original: determines which of the specified floating-point status flags are set The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) |
(C99) |
soulève les spécifiées exceptions de virgule flottante Original: raises the specified 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. (fonction) |
(C99) (C99) |
copie de l'état des drapeaux spécifiés état à virgule flottante en provenance ou à l'environnement en virgule flottante Original: copies the state of the specified floating-point status flags from or to the floating-point environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) |
(C99) (C99) |
obtient ou définit direction d'arrondi Original: gets or sets rounding direction The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) |
(C99) |
sauvegarde ou restaure l'environnement actuel point flottant Original: saves or restores the current floating point environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) |
(C99) |
sauvegarde de l'environnement, efface tous les indicateurs d'état et ignore toutes les erreurs futures Original: saves the environment, clears all status flags and ignores all future errors The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) |
(C99) |
restaure l'environnement en virgule flottante et soulève le lever des exceptions précédemment Original: restores the floating-point environment and raises the previously raise exceptions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) |
Macros
exceptions de virgule flottante 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. (constante macro) | |
direction d'arrondi en virgule flottante Original: floating-point rounding direction The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (constante macro) | |
(C99) |
défaut en virgule flottante environnement Original: default floating-point environment The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (constante macro) |
| This section is incomplete Reason: FENV_ACCESS |