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    <metanoindex/>

     
    C++
     
    Bibliothque de chanes de caractres
    Chanes zro terminal
    Original:
    Null-terminated strings
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    Les chanes d'octets
    Chaines multi-octets
    Les chanes tendues
    Classes
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    Classes
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    basic_string
    char_traits
     
    Chanes d'octets zro terminal
    Fonctions
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    Functions
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    Manipulation caractre
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    Character manipulation
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    Conversion aux formats numriques
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    Conversions to numeric formats
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    La manipulation de chanes
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    String manipulation
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    strcpy
    strncpy
    strcat
    strncat
    strxfrm
    Examen chane
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    String examination
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    Manipulation de la mmoire
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    Memory manipulation
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    memchr
    memcmp
    memset
    memcpy
    memmove
    Divers
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    Miscellaneous
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    strerror
     
    <tbody> </tbody>
    Dclar dans l'en-tte <cstdlib>
    double atof( const char *str );
    Interprter une valeur virgule flottante en une chane d'octets pointe par str .
    Original:
    Interprets an floating point value in a byte string pointed to by str.
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    Fonction supprime les caractres blancs (tel que dtermin par std::isspace()) jusqu'au premier caractre non-blanc est trouv. Ensuite, il faut autant de caractres que possible pour former une reprsentation en virgule flottante valide et les convertit en valeur virgule flottante. La valeur du point flottante valide peut tre 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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    • dcimal expression en virgule flottante. Il se compose des lments suivants:
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      decimal floating point expression. It consists of the following parts:
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    • (en option) signe plus ou moins
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      (en option) plus or minus sign
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    • squence non vide de chiffres dcimaux contenant ventuellement un point dcimal (dfinit mantisse)
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      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 squence non vide de chiffres dcimaux (dfinit exposant)
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      (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 virgule flottante. Il se compose des lments suivants:
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      binary floating point expression. It consists of the following parts:
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    • (en option) signe plus ou moins
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      (en option) plus or minus sign
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    • 0x or 0X
    • squence non vide de chiffres hexadcimaux contenant ventuellement un point dcimal (dfinit mantisse)
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      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 squence non vide de chiffres hexadcimaux (dfinit exposant)
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      (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 lments suivants:
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      infinity expression. It consists of the following parts:
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    • (en option) signe plus ou moins
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      (en option) plus or minus sign
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    • INF ou INFINITY ignorant la casse
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      INF or INFINITY ignoring case
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    • un nombre non-expression. Il se compose des lments suivants:
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      not-a-number expression. It consists of the following parts:
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    • (en option) signe plus ou moins
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      (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 caractres alphanumriques. Le rsultat est une valeur 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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    Paramtres

    str -
    pointeur vers la chane d'octets termine par NULL doit tre interprt
    Original:
    pointer to the null-terminated byte string to be interpreted
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    Retourne la valeur

    double valeur correspondant au contenu du str en cas de succs. Si la valeur convertie tombe hors de la plage du type de retour, la valeur de retour est indfinie. Si aucune conversion peut tre effectue, 0.0 est retourn .
    Original:
    double value corresponding to the contents of str on success. If the converted value falls out of range of the return type, the return value is undefined. If no conversion can be performed, 0.0 is returned.
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    Exemple

    This section is incomplete
    Reason: no example

    Voir aussi
    convertit une chane d'octets en une valeur virgule flottante
    Original:
    converts a byte string to a floating point value
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    (fonction) [edit]
    C documentation for atof
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