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      std::numeric_limits::max_digits10

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      numeric_limits::max_digits10(C++11)
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      staticconstexprint max_digits10
      		(desde 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​
      signedchar​0​
      unsignedchar​0​
      wchar_t​0​
      char16_t​0​
      char32_t​0​
      short​0​
      unsignedshort​0​
      int​0​
      unsignedint​0​
      long​0​
      unsignedlong​0​
      longlong​0​
      unsignedlonglong​0​
      floatstd::floor(std::numeric_limits<float>::digits*std::log10(2)+2)
      doublestd::floor(std::numeric_limits<double>::digits*std::log10(2)+2)
      longdoublestd::floor(std::numeric_limits<longdouble>::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]
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