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    Modèle:cpp/string/cvt str2float

    De cppreference.com
    Fonction supprime les caractères blancs (tel que déterminé par std::isspace()) jusqu'au premier caractère non-blanc est trouvé. Ensuite, il faut autant de caractères que possible pour former une représentation en virgule flottante valide et les convertit en valeur à virgule flottante. La valeur du point flottante valide peut être l'un des suivants:
    Original:
    Function discards any whitespace characters (as determined by std::isspace()) until first non-whitespace character is found. Then it takes as many characters as possible to form a valid floating point representation and converts them to floating point value. The valid floating point value can be one of the following:
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    • décimal expression en virgule flottante. Il se compose des éléments suivants:
      Original:
      decimal floating point expression. It consists of the following parts:
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    • (en option) signe plus ou moins
      Original:
      (en option) plus or minus sign
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    • séquence non vide de chiffres décimaux contenant éventuellement un point décimal (définit mantisse)
      Original:
      nonempty sequence of decimal digits optionally containing a decimal point character (defines significand)
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    • (en option) e ou E suivi avec moins optionnels ou signe plus et la séquence non vide de chiffres décimaux (définit exposant)
      Original:
      (en option) e or E followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent)
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    • expression binaire à virgule flottante. Il se compose des éléments suivants:
      Original:
      binary floating point expression. It consists of the following parts:
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    • (en option) signe plus ou moins
      Original:
      (en option) plus or minus sign
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    • 0x or 0X
    • séquence non vide de chiffres hexadécimaux contenant éventuellement un point décimal (définit mantisse)
      Original:
      nonempty sequence of hexadecimal digits optionally containing a decimal point character (defines significand)
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    • (en option) p ou P suivi avec moins optionnels ou signe plus et la séquence non vide de chiffres hexadécimaux (définit exposant)
      Original:
      (en option) p or P followed with optional minus or plus sign and nonempty sequence of hexadecimal digits (defines exponent)
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    • l'infini expression. Il se compose des éléments suivants:
      Original:
      infinity expression. It consists of the following parts:
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    • (en option) signe plus ou moins
      Original:
      (en option) plus or minus sign
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    • INF ou INFINITY ignorant la casse
      Original:
      INF or INFINITY ignoring case
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    • un nombre non-expression. Il se compose des éléments suivants:
      Original:
      not-a-number expression. It consists of the following parts:
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    • (en option) signe plus ou moins
      Original:
      (en option) plus or minus sign
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    • NAN ou NAN(' char_sequence ) en ignorant la casse de la partie NAN. Char_sequence' ne peut contenir que des caractères alphanumériques. Le résultat est une valeur à virgule flottante NaN calme .
      Original:
      NAN or NAN(char_sequence) ignoring case of the NAN part. char_sequence can only contain alphanumeric characters. The result is a quiet NaN floating point value.
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