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std::numeric_limits::max_digits10

Da cppreference.com.

 
 
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Tipo di supporto
Tipi base
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Tipi fondamentali
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Limiti numerici
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numeric_limits
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enable_if(C++11)
conditional(C++11)
common_type(C++11)
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Digitare costanti tratto
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integral_constant(C++11)
 
 
static constexpr int max_digits10
(dal C++11)
Il valore del std::numeric_limits<T>::max_digits10 è il numero di base-10 cifre che sono necessari per rappresentare univocamente tutti i valori distinti della T tipo, come necessario per la serializzazione / deserializzazione al testo. Questa costante è significativo per tutti i tipi a virgola mobile.
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.
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[modifica] Specializzazioni standard

T
valore di std::numeric_limits<T>::max_digits10
Original:
value of std::numeric_limits<T>::max_digits10
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/* 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)

[modifica] Note

A differenza di operazioni più matematiche, la conversione di un valore a virgola mobile al testo e ritorno è esatto e fino a quando almeno max_digits10 sono stati utilizzati (9 per float, 17 per double): è garantito per produrre la stessa variabile punto di valore, anche se la rappresentazione di testo intermedio non è esatta. Si può prendere più di un centinaio di cifre decimali per rappresentare il valore preciso di un float in notazione decimale.
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.
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[modifica] Vedi anche

[statico]
la radice o base intero utilizzato dalla rappresentazione del tipo specificato
Original:
the radix or integer base used by the representation of the given type
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(pubblico membro statico costante) [edit]
[statico]
numero di cifre radix che possono essere rappresentati senza cambiamenti
Original:
number of radix digits that can be represented without change
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(pubblico membro statico costante) [edit]
[statico]
numero di cifre decimali che possono essere rappresentati senza modifiche
Original:
number of decimal digits that can be represented without change
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(pubblico membro statico costante) [edit]
[statico]
oltre la più piccola potenza negativa della radice che è una valida virgola mobile normalizzato valore uno
Original:
one more than the smallest negative power of the radix that is a valid normalized floating-point value
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(pubblico membro statico costante) [edit]
[statico]
maggiore della massima potenza intera della radice che è una valida finita valore a virgola mobile uno
Original:
one more than the largest integer power of the radix that is a valid finite floating-point value
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(pubblico membro statico costante) [edit]