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    std::numeric_limits::max_digits10

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    <tbody> </tbody>
    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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    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)

    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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    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) [modifica]
    [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) [modifica]
    [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) [modifica]
    [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) [modifica]
    [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) [modifica]