std::stof, std::stod, std::stold — cppreference.com

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Déclaré dans l'en-tête `<string>`
`float stof( const std::string& str, size_t *pos = 0 );`	(1)	(depuis C++11)
`double stod( const std::string& str, size_t *pos = 0 );`	(2)	(depuis C++11)
`long double stold( const std::string& str, size_t *pos = 0 );`	(3)	(depuis C++11)

Interpréter une valeur à virgule flottante dans un str chaîne .

Original:

Interprets a floating point value in a string 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)
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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L'indice du premier caractère non converti est stocké dans pos. Si NULL est passé comme pos, il est ignoré .

Original:

The index of the first unconverted character is stored in pos. If NULL is passed as pos, it is ignored.

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Paramètres

str	-	la chaîne à convertir Original: the string to convert The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
pos	-	traiter de nombre entier pour stocker l'index du premier caractère non converti Original: address of integer to store the index of the first unconverted character The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Retourne la valeur

La chaîne convertie vers le type spécifié en virgule flottante .

Original:

The string converted to the specified floating point type.

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Exceptions

std::invalid_argument si aucune conversion peut être effectuée

Original:

std::invalid_argument if no conversion could be performed

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std::out_of_range si la valeur convertie tomberait hors de la plage du type de résultat .

Original:

std::out_of_range if the converted value would fall out of the range of the result type.

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Voir aussi


	convertit une chaîne en un entier signé Original: converts a string to an signed integer The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) [edit]

	convertit une chaîne en un entier non signé Original: converts a string to an unsigned integer The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) [edit]