std::numeric_limits::round_style
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<metanoindex/>
<tbody> </tbody> static const std::float_round_style round_style |
(bis C + +11) | |
static constexpr std::float_round_style round_style |
(seit C++11) | |
Der Wert der
std::numeric_limits<T>::round_stylem identifiziert die Rundung Stil von der Floating-Point-Typ T wenn ein Wert, der nicht einer der genau repesentable Werte T in einem Objekt dieses Typs gespeichert werden .Original:
The value of
std::numeric_limits<T>::round_stylem identifies the rounding style used by the floating-point type T whenever a value that is not one of the exactly repesentable values of T is stored in an object of that type.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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Standard Spezialisierungen
T
|
Wert
std::numeric_limits<T>::round_style Original: value of std::numeric_limits<T>::round_style The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| /* non-specialized */ | std::round_toward_zero |
bool
|
std::round_toward_zero |
char
|
std::round_toward_zero |
signed char
|
std::round_toward_zero |
unsigned char
|
std::round_toward_zero |
wchar_t
|
std::round_toward_zero |
char16_t
|
std::round_toward_zero |
char32_t
|
std::round_toward_zero |
short
|
std::round_toward_zero |
unsigned short
|
std::round_toward_zero |
int
|
std::round_toward_zero |
unsigned int
|
std::round_toward_zero |
long
|
std::round_toward_zero |
unsigned long
|
std::round_toward_zero |
long long
|
std::round_toward_zero |
unsigned long long
|
std::round_toward_zero |
float
|
Regel std::round_to_nearest
Original: usually std::round_to_nearest The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
double
|
Regel std::round_to_nearest
Original: usually std::round_to_nearest The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
long double
|
Regel std::round_to_nearest
Original: usually std::round_to_nearest The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Beispiel
Der Dezimalwert
und 0x1.999999999999a*2-4
. Abgerundet zum nächsten darstellbaren Wert ergibt sich 0x1.999999999999a*2-4
.
0.1 kann nicht durch eine binäre Gleitkommazahl Typ dargestellt werden. Wenn in einem IEEE-745 double gespeichert, fällt sie zwischen 0x1.9999999999999*2-4und 0x1.999999999999a*2-4
. Abgerundet zum nächsten darstellbaren Wert ergibt sich 0x1.999999999999a*2-4
.
Original:
The decimal value
and 0x1.999999999999a*2-4
. Rounding to nearest representable value results in 0x1.999999999999a*2-4
.
0.1 cannot be represented by a binary floating-point type. When stored in an IEEE-745 double, it falls between 0x1.9999999999999*2-4and 0x1.999999999999a*2-4
. Rounding to nearest representable value results in 0x1.999999999999a*2-4
.
The text has been machine-translated via Google Translate.
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Ähnlich der Dezimalwert 0,3, welche zwischen 0x1.3333333333333*2-2
und 0x1.3333333333334*2-2
wird gerundet und wird als 0x1.3333333333333*2-2
gespeichert .
und 0x1.3333333333334*2-2
wird gerundet und wird als 0x1.3333333333333*2-2
gespeichert .
Original:
Similarly, the decimal value 0.3, which is between 0x1.3333333333333*2-2
and 0x1.3333333333334*2-2
is rounded to nearest and is stored as 0x1.3333333333333*2-2
.
and 0x1.3333333333334*2-2
is rounded to nearest and is stored as 0x1.3333333333333*2-2
.
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.
#include <iostream>
#include <limits>
int main()
{
std::cout << std::hexfloat << "The decimal 0.1 is stored in a double as "
<< 0.1 << '\n'
<< "The decimal 0.3 is stored in a double as "
<< 0.3 << '\n'
<< "The rounding style is " << std::numeric_limits<double>::round_style << '\n';
}
Output:
The decimal 0.1 is stored in a double as 0x1.999999999999ap-4
The decimal 0.3 is stored in a double as 0x1.3333333333333p-2
The rounding style is 1
Siehe auch
zeigt Gleitkommazahl Rundungsmodi Original: indicates floating-point rounding modes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (enum) | |