std::stof, std::stod, std::stold

 

C++

Langage

Concepts

Bibliothèque d'utilitaires

Bibliothèque pour les chaînes de caractères

Bibliothèque de conteneurs

Bibliothèque d'algorithmes

Bibliothèque d'itérateurs

Bibliothèque pour le calcul numérique

Bibliothèque pour les entrées/sorties

Bibliothèque pour la régionalisation

Bibliothèque pour les expressions régulières (C++11)

Bibliothèque pour les opérations atomiques (C++11)

Bibliothèque pour les processus légers (threads) (C++11)

 

Bibliothèque de chaînes de caractères

Chaînes à zéro terminal Original: Null-terminated strings The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Les chaînes d'octets

Chaines multi-octets

Les chaînes étendues

Classes Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string

char_traits

 

std::basic_string

Les fonctions membres Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::basic_string

basic_string::operator=

basic_string::assign

basic_string::get_allocator

Elément d'accès Original: Element access The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::at

basic_string::operator[]

basic_string::front (C++11)

basic_string::back (C++11)

basic_string::data

basic_string::c_str

Les itérateurs Original: Iterators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::begin basic_string::cbegin (C++11)

basic_string::end basic_string::cend (C++11)

basic_string::rbegin basic_string::crbegin (C++11)

basic_string::rend basic_string::crend (C++11)

Capacité Original: Capacity The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::empty

basic_string::size

basic_string::length

basic_string::max_size

basic_string::reserve

basic_string::capacity

basic_string::shrink_to_fit (C++11)

Opérations Original: Operations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::clear

basic_string::insert

basic_string::erase

basic_string::push_back

basic_string::pop_back (C++11)

basic_string::append

basic_string::operator+=

basic_string::compare

basic_string::replace

basic_string::substr

basic_string::copy

basic_string::resize

basic_string::swap

Recherche Original: Search The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::find

basic_string::rfind

basic_string::find_first_of

basic_string::find_first_not_of

basic_string::find_last_of

basic_string::find_last_not_of

Constantes Original: Constants The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_string::npos

Tiers fonctions Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

operator+

operator== operator!= operator< operator> operator<= operator>=

swap(std::basic_string)

operator<< operator>>

getline

stoi stol stoll (C++11) (C++11) (C++11)

stoul stoull (C++11) (C++11)

stof stod stold (C++11) (C++11) (C++11)

to_string (C++11)

to_wstring (C++11)

Classes d'aide Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

hash<std::string> hash<std::wstring> hash<std::u32string> hash<std::u16string> (C++11)

 

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

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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:

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

• décimal expression en virgule flottante. Il se compose des éléments suivants:

  Original:

  decimal floating point expression. It consists of the following parts:

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.

• (en option) signe plus ou moins

  Original:

  (en option) plus or minus sign

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.
• 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)

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.
• (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)

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.

• expression binaire à virgule flottante. Il se compose des éléments suivants:

  Original:

  binary floating point expression. It consists of the following parts:

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.

• (en option) signe plus ou moins

  Original:

  (en option) plus or minus sign

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.
• 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)

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.
• (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)

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.

• l'infini expression. Il se compose des éléments suivants:

  Original:

  infinity expression. It consists of the following parts:

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.

• (en option) signe plus ou moins

  Original:

  (en option) plus or minus sign

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.
• INF ou INFINITY ignorant la casse

  Original:

  INF or INFINITY ignoring case

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.

• un nombre non-expression. Il se compose des éléments suivants:

  Original:

  not-a-number expression. It consists of the following parts:

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.

• (en option) signe plus ou moins

  Original:

  (en option) plus or minus sign

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.
• 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.

  The text has been machine-translated via Google Translate.
  You can help to correct and verify the translation. Click here for instructions.

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.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Exceptions

std::invalid_argument si aucune conversion peut être effectuée

Original:

std::invalid_argument if no conversion could be performed

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

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.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Voir aussi

stoi stol stoll (C++11) (C++11) (C++11)	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)
stoul stoull (C++11) (C++11)	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)