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std::numeric_limits::max_digits10

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std::numeric_limits
 
static constexpr int max_digits10
(a partir do C++ 11)
O valor de std::numeric_limits<T>::max_digits10 é o número de base-10 dígitos que são necessários para representar unicamente os valores distintos da T tipo, como necessário para a serialização / desserialização de texto. Esta constante é significativo para todos os tipos de ponto flutuante.
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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[editar] Especializações padrão

T
valor de 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)

[editar] Notas

Ao contrário a maioria das operações matemáticas, a conversão de um valor de ponto flutuante ao texto e de volta é exata, desde que pelo menos max_digits10 foram utilizados (9 para float, 17 para double): é garantido para produzir o mesmo flutuante ponto de valor, mesmo que a representação de texto intermediário não é exata. Pode levar mais de uma centena de casas decimais para representar o valor preciso de um float em notação decimal.
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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[editar] Veja também

[estática]
a raiz ou base inteiro usado pela representação do tipo de dado
Original:
the radix or integer base used by the representation of the given type
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(membro estático público constante) [edit]
[estática]
número de dígitos radix que podem ser representadas sem alterações
Original:
number of radix digits that can be represented without change
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(membro estático público constante) [edit]
[estática]
número de dígitos decimais que podem ser representadas sem alterações
Original:
number of decimal digits that can be represented without change
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(membro estático público constante) [edit]
[estática]
mais um do que o menor poder negativo do radix que é um valor válido de ponto flutuante normalizado
Original:
one more than the smallest negative power of the radix that is a valid normalized floating-point value
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(membro estático público constante) [edit]
[estática]
um a mais que o maior poder inteiro da raiz que é um valor válido de ponto flutuante finita
Original:
one more than the largest integer power of the radix that is a valid finite floating-point value
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(membro estático público constante) [edit]