std::numeric_limits::max_digits10
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| static constexpr int max_digits10 |
(seit C++11) | |
Der Wert std::numeric_limits<T>::max_digits10 ist die Anzahl der Basis-10 Ziffern, die erforderlich sind, um eindeutig repräsentieren alle unterschiedlichen Werte des Typs
T wie notwendig für die Serialisierung / Deserialisierung um Text sind. Diese Konstante ist sinnvoll für alle Floating-Point-Typen . Original:
The value of std::numeric_limits<T>::max_digits10 is the number of base-10 digits that are necessary to uniquely represent all distinct values of the type
T, such as necessary for serialization/deserialization to text. This constant is meaningful for all floating-point types. 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.
[Bearbeiten] Standard Spezialisierungen
T
|
Wert std::numeric_limits<T>::max_digits10
Original: value of std::numeric_limits<T>::max_digits10 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| /* non-specialized */ | 0 |
| bool | 0 |
| char | 0 |
| signed char | 0 |
| unsigned char | 0 |
| wchar_t | 0 |
| char16_t | 0 |
| char32_t | 0 |
| short | 0 |
| unsigned short | 0 |
| int | 0 |
| unsigned int | 0 |
| long | 0 |
| unsigned long | 0 |
| long long | 0 |
| unsigned long long | 0 |
| float | std::floor(std::numeric_limits<float>::digits * std::log10(2) + 2) |
| double | std::floor(std::numeric_limits<double>::digits * std::log10(2) + 2) |
| long double | std::floor(std::numeric_limits<long double>::digits * std::log10(2) + 2) |
[Bearbeiten] Notes
Anders als die meisten mathematischen Operationen, die Umwandlung einer Floating-Point-Wert in Text und zurück genaue, solange mindestens
max_digits10 verwendet wurden (9 für float, 17 für double): es wird garantiert die gleiche variabel produzieren Punktwert, obwohl das Zwischenprodukt Textdarstellung nicht exakt ist. Es kann mehr als hundert Dezimalziffern, den genauen Wert eines float dezimal darstellen .Original:
Unlike most mathematical operations, the conversion of a floating-point value to text and back is exact as long as at least
max_digits10 were used (9 for float, 17 for double): it is guaranteed to produce the same floating-point value, even though the intermediate text representation is not exact. It may take over a hundred decimal digits to represent the precise value of a float in decimal notation.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.
[Bearbeiten] Siehe auch
| [statisch] |
die Radix oder Integer Basis durch die Darstellung des angegebenen Typs verwendet Original: the radix or integer base used by the representation of the given type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) |
| [statisch] |
Anzahl von Ziffern, die radix unverändert dargestellt werden kann Original: number of radix digits that can be represented without change The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) |
| [statisch] |
Anzahl der Dezimalstellen, die ohne Änderung dargestellt werden können Original: number of decimal digits that can be represented without change The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) |
| [statisch] |
eine mehr als die kleinste negative Macht des Radix, die eine gültige normalisierten Gleitkomma-Wert ist Original: one more than the smallest negative power of the radix that is a valid normalized floating-point value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) |
| [statisch] |
eine mehr als die größte ganze Macht der radix, die eine gültige endlichen Floating-Point-Wert ist Original: one more than the largest integer power of the radix that is a valid finite floating-point value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (public static Mitglied konstanten) |
