Floating point environment
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La virgola mobile ambiente è l'insieme di virgola mobile flag di stato e le modalità di controllo supportate dall'implementazione. Si tratta di thread locale, ogni thread eredita lo stato iniziale del suo ambiente in virgola mobile dal thread principale. Operazioni a virgola mobile modificare le virgola mobile flag di stato per indicare i risultati anormali o informazioni ausiliarie. Lo stato di virgola mobile modalità di controllo influisce sui risultati di alcune operazioni in virgola mobile.
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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Il floating-point ambiente e la modifica è significativa solo quando è impostato su #pragma STDC FENV_ACCESS
ON. In caso contrario, l'attuazione è libero di pensare che in virgola mobile modalità di controllo sono sempre quelli di default e che in virgola mobile flag di stato non sono mai testati o modificati. In pratica, alcuni compilatori attuali supportano il #pragma in modo esplicito, ma la maggior parte dei compilatori consentono l'accesso significativo al floating-point ambiente comunque.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.
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[modifica] Tipi
Definizione nell'header <fenv.h> | |
| fenv_t | Il tipo che rappresenta l'intero ambiente virgola mobile 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 | Il tipo di rappresentanza di tutti in virgola mobile flag di stato collettivamente 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. |
[modifica] Funzioni
(C99) | cancella le specificati virgola mobile flag di stato 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. (funzione) |
(C99) | determina quale delle specificati virgola mobile flag di stato vengono impostati 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. (funzione) |
(C99) | solleva le specifiche eccezioni a virgola mobile 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. (funzione) |
(C99) (C99) | copia lo stato delle specificati virgola mobile flag di stato dal o al floating-point ambiente 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. (funzione) |
(C99) (C99) | ottiene o imposta la direzione di arrotondamento 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. (funzione) |
(C99) | salva o ripristina l'ambiente corrente in virgola mobile 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. (funzione) |
(C99) | salva l'ambiente, cancella tutti i flag di stato e ignora tutti gli errori futuri 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. (funzione) |
(C99) | ripristina la virgola mobile e solleva l'ambiente precedentemente generare eccezioni 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. (funzione) |
[modifica] Macro
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) | |
virgola mobile arrotondamento direzione 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. (macro costante) | |
(C99) | predefinito in virgola mobile ambiente 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. (macro costante) |
| This section is incomplete Reason: FENV_ACCESS |
