std::fegetround, std::fesetround
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| Déclaré dans l'en-tête <cfenv>
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| int fesetround( int round ) |
(1) | (depuis C++11) |
| int fegetround() |
(2) | (depuis C++11) |
Tentatives pour établir la direction d'arrondi en virgule flottante égale à la
2) round argument, qui devrait être l'un des macros flottant arrondi de points . Original:
Attempts to establish the floating-point rounding direction equal to the argument
round, which is expected to be one of the macros flottant arrondi de points. The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
Retourne la valeur de la flotter macro arrondi point qui correspond à la direction d'approximation courante .
Original:
Returns the value of the flotter macro arrondi point that corresponds to the current rounding direction.
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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Sommaire |
[modifier] Paramètres
| round | - | direction arrondissement, l'un des macros flottant arrondi de points
Original: rounding direction, one of macros flottant arrondi de points The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[modifier] Retourne la valeur
1)0 en cas de succès, non nuls autrement .
2) Original:
0 on success, non-zero otherwise.
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l'flotter macro arrondi point décrivant la direction d'approximation courante ou une valeur négative si la direction ne peut pas être déterminée
Original:
the flotter macro arrondi point describing the current rounding direction or a negative value if the direction cannot be determined
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[modifier] Exemple
#include <cmath> #include <cfenv> #include <iostream> int main() { #pragma STDC FENV_ACCESS ON std::fesetround(FE_DOWNWARD); std::cout << "rounding using FE_DOWNWARD: \n" << std::fixed << " 12.0 -> " << std::nearbyint(12.0) << '\n' << " 12.1 -> " << std::nearbyint(12.1) << '\n' << "-12.1 -> " << std::nearbyint(-12.1) << '\n' << " 12.5 -> " << std::nearbyint(12.5) << '\n' << " 12.9 -> " << std::nearbyint(12.9) << '\n' << "-12.9 -> " << std::nearbyint(-12.9) << '\n' << " 13.0 -> " << std::nearbyint(13.0) << '\n'; std::fesetround(FE_TONEAREST); std::cout << "rounding using FE_TONEAREST: \n" << " 12.0 -> " << std::nearbyint(12.0) << '\n' << " 12.1 -> " << std::nearbyint(12.1) << '\n' << "-12.1 -> " << std::nearbyint(-12.1) << '\n' << " 12.5 -> " << std::nearbyint(12.5) << '\n' << " 12.9 -> " << std::nearbyint(12.9) << '\n' << "-12.9 -> " << std::nearbyint(-12.9) << '\n' << " 13.0 -> " << std::nearbyint(13.0) << '\n'; }
Résultat :
rounding using FE_DOWNWARD: 12.0 -> 12.000000 12.1 -> 12.000000 -12.1 -> -13.000000 12.5 -> 12.000000 12.9 -> 12.000000 -12.9 -> -13.000000 13.0 -> 13.000000 rounding using FE_TONEAREST: 12.0 -> 12.000000 12.1 -> 12.000000 -12.1 -> -12.000000 12.5 -> 12.000000 12.9 -> 13.000000 -12.9 -> -13.000000 13.0 -> 13.000000
[modifier] Voir aussi
| (C++11) |
entier le plus proche en utilisant le mode d'arrondi courant Original: nearest integer using current rounding mode The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) |
| (C++11) (C++11) (C++11) |
entier le plus proche en utilisant le mode d'arrondi courant à l'exception si le résultat est différent Original: nearest integer using current rounding mode with exception if the result differs The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) |
