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      std::numeric_limits::max_digits10

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      C++
       
      Bibliothèque d'utilitaires
       
      Soutien aux types fondamentaux
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      std::numeric_limits
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      numeric_limits::digits10
      numeric_limits::max_digits10 (C++11)
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      numeric_limits::min_exponent10
      numeric_limits::max_exponent
      numeric_limits::max_exponent10
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      staticconstexprint max_digits10
      		 (depuis C++11)
      La valeur de std::numeric_limits<T>::max_digits10 est le nombre de chiffres de base-10 qui sont nécessaires pour représenter de façon unique l'ensemble des valeurs distinctes de la T type, comme nécessaire pour la sérialisation / désérialisation de texte. Cette constante est significative pour tous les types à virgule flottante .
      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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      [modifier]Spécialisations standard

      T
      valeur 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)

      [modifier]Notes

      Contrairement à la plupart des opérations mathématiques, la conversion d'une valeur à virgule flottante au texte et à l'arrière est exacte' aussi longtemps qu'au moins max_digits10 ont été utilisés (9 pour float, 17 pour double): il est garanti pour produire la même variable point de valeur, même si la représentation textuelle intermédiaire n'est pas exacte. Cela peut prendre plus d'une centaine décimales pour représenter la valeur précise d'un float en notation décimale .
      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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      [modifier]Voir aussi

      [
      statique
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      static
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      ]
      la base ou la base utilisée par nombre entier de la représentation du type donné
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      the radix or integer base used by the representation of the given type
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      (constante membre statique publique)[edit]
      [
      statique
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      static
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      ]
      nombre de chiffres radix qui peuvent être représentées sans changement
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      number of radix digits that can be represented without change
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      (constante membre statique publique)[edit]
      [
      statique
      Original:
      static
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      ]
      nombre de chiffres décimaux qui peuvent être représentées sans changement
      Original:
      number of decimal digits that can be represented without change
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      (constante membre statique publique)[edit]
      [
      statique
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      static
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      ]
      un de plus que la plus petite puissance négative de la racine qui est valide normalisé valeur à virgule flottante
      Original:
      one more than the smallest negative power of the radix that is a valid normalized floating-point value
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      (constante membre statique publique)[edit]
      [
      statique
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      static
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      ]
      un de plus que la plus grande puissance entière de la racine qui est valide finie valeur à virgule flottante
      Original:
      one more than the largest integer power of the radix that is a valid finite floating-point value
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      (constante membre statique publique)[edit]
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