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

 

C++

Lenguaje

Cabeceras

Conceptos

Biblioteca de utilidades

Biblioteca de cadenas

Biblioteca de contenedores

Biblioteca de algoritmos

Biblioteca de iteradores

Biblioteca numérica

Biblioteca de entrada/salida

Biblioteca de localización

Biblioteca de expresiones regulares (C++11)

Biblioteca de operaciones atómicas (C++11)

Biblioteca de tareas/subprocesos (C++11)

 

Strings biblioteca

Terminadas en nulo 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.

Cadenas de bytes

Multibyte cuerdas

Cadenas anchas

Clases 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

Las funciones miembro 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

Elemento acceso 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

Los iteradores 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)

Capacidad 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)

Operaciones 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

Buscar 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

Terceros funciones 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)

Clases de ayuda 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)

 

Defined in header <string>
float       stof( const std::string& str, size_t *pos = 0 );	(1)	(desde C++11)
double      stod( const std::string& str, size_t *pos = 0 );	(2)	(desde C++11)
long double stold( const std::string& str, size_t *pos = 0 );	(3)	(desde C++11)

Interpreta un valor de punto flotante en una cadena str .

Original:

Interprets a floating point value in a string str.

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Función descarta los espacios en blanco (según lo determinado por std::isspace()) hasta que primero no está en blanco se encuentra. Luego se toma como caracteres posible para formar una representación válida de punto flotante y los convierte en valor de punto flotante. El valor válido de coma flotante puede ser uno de los siguientes:

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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• expresión decimal de coma flotante. Se compone de las siguientes partes:

  Original:

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

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• (opcional) más o el signo menos

  Original:

  (opcional) plus or minus sign

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• no vacío secuencia de dígitos decimales que contiene opcionalmente un carácter de punto decimal (define mantisa)

  Original:

  nonempty sequence of decimal digits optionally containing a decimal point character (defines significand)

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• (opcional) e o E seguido con menos opcionales o signo más y la secuencia no vacía de dígitos decimales (define exponente)

  Original:

  (opcional) e or E followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent)

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• expresión binaria de punto flotante. Se compone de las siguientes partes:

  Original:

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

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• (opcional) más o el signo menos

  Original:

  (opcional) plus or minus sign

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• 0x or 0X
• no vacío secuencia de dígitos hexadecimales que contienen opcionalmente un carácter de punto decimal (define mantisa)

  Original:

  nonempty sequence of hexadecimal digits optionally containing a decimal point character (defines significand)

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• (opcional) p o P seguido con menos opcionales o signo más y la secuencia no vacía de dígitos hexadecimales (define exponente)

  Original:

  (opcional) p or P followed with optional minus or plus sign and nonempty sequence of hexadecimal digits (defines exponent)

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• infinito expresión. Se compone de las siguientes partes:

  Original:

  infinity expression. It consists of the following parts:

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• (opcional) más o el signo menos

  Original:

  (opcional) plus or minus sign

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• INF o INFINITY ignorando mayúsculas y minúsculas

  Original:

  INF or INFINITY ignoring case

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• no-un número-expresión. Se compone de las siguientes partes:

  Original:

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

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• (opcional) más o el signo menos

  Original:

  (opcional) plus or minus sign

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• NAN o NAN(' char_sequence ) ignorando caso de la parte NAN. Char_sequence' sólo puede contener caracteres alfanuméricos. El resultado es un tranquilo valor NaN punto flotante .

  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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El índice del carácter no convertido se almacena primero en pos. Si NULL se pasa como pos, se omite .

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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Parámetros

str	-	la cadena a 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	-	tratar de entero para almacenar el índice del carácter no convertido primero 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.

Valor de retorno

La cadena convertida al tipo de punto flotante especificado .

Original:

The string converted to the specified floating point type.

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Excepciones

std::invalid_argument si la conversión no se pudo realizar

Original:

std::invalid_argument if no conversion could be performed

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std::out_of_range si el valor convertido caerían fuera de la gama del tipo del resultado .

Original:

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

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Ver también

stoi stol stoll (C++11) (C++11) (C++11)	convierte una cadena a un entero con signo 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. (función)
stoul stoull (C++11) (C++11)	convierte una cadena a un entero sin signo 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. (función)