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std::atof

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< cpp‎ | string‎ | byte

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C++
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
Original:
Null-terminated strings
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Les chaînes d'octets
Chaines multi-octets
Les chaînes étendues
Classes
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Classes
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basic_string
char_traits
 
Chaînes d'octets à zéro terminal
Fonctions
Original:
Functions
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Manipulation caractère
Original:
Character manipulation
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Conversion aux formats numériques
Original:
Conversions to numeric formats
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La manipulation de chaînes
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Examen chaîne
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String examination
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Manipulation de la mémoire
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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
 
Déclaré dans l'en-tête <cstdlib>
double atof( const char *str );
Interpréter une valeur à virgule flottante en une chaîne d'octets pointée par str .
Original:
Interprets an floating point value in a byte string pointed to by str.
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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)
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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 séquence non vide de chiffres décimaux (définit 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 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)
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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 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
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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 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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Sommaire

[modifier] Paramètres

str -
pointeur vers la chaîne d'octets terminée par NULL doit être interprété
Original:
pointer to the null-terminated byte string to be interpreted
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[modifier] Retourne la valeur

double valeur correspondant au contenu du str en cas de succès. Si la valeur convertie tombe hors de la plage du type de retour, la valeur de retour est indéfinie. Si aucune conversion peut être effectuée, 0.0 est retourné .
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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[modifier] Exemple

This section is incomplete
Reason: no example

[modifier] Voir aussi
convertit une chaîne d'octets en une valeur à 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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