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std::numeric_limits::round_style

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numeric_limits
C numerische begrenzt Schnittstelle
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std::numeric_limits
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float_round_style
float_denorm_style
 
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.
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[Bearbeiten] Standard Spezialisierungen

T
Wert std::numeric_limits<T>::round_style
Original:
value of std::numeric_limits<T>::round_style
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/* 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
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double
Regel std::round_to_nearest
Original:
usually std::round_to_nearest
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long double
Regel std::round_to_nearest
Original:
usually std::round_to_nearest
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[Bearbeiten] Beispiel

Der Dezimalwert 0.1 kann nicht durch eine binäre Gleitkommazahl Typ dargestellt werden. Wenn in einem IEEE-745 double gespeichert, fällt sie zwischen 0x1.9999999999999*2-4
 und 0x1.999999999999a*2-4
. Abgerundet zum nächsten darstellbaren Wert ergibt sich 0x1.999999999999a*2-4
 .
Original:
The decimal value 0.1 cannot be represented by a binary floating-point type. When stored in an IEEE-745 double, it falls between 0x1.9999999999999*2-4
 and 0x1.999999999999a*2-4
. Rounding to nearest representable value results in 0x1.999999999999a*2-4
.
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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 .
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
.
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#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

[Bearbeiten] Siehe auch
zeigt Gleitkommazahl Rundungsmodi
Original:
indicates floating-point rounding modes
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(enum) [edit]
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