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

 

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Biblioteca cordas

Strings terminadas 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.

Cadeias de bytes

Multibyte cordas

Cordas de largura

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

Funções de membro 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

acesso. Elemento 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

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)

Capacidade 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)

Operações 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

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basic_string::push_back

basic_string::pop_back (C++11)

basic_string::append

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basic_string::compare

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basic_string::substr

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Pesquisar 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

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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

Não-membros funções 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

stoistolstoll (C++11)(C++11)(C++11)

stoulstoull (C++11)(C++11)

stofstodstold (C++11)(C++11)(C++11)

to_string (C++11)

to_wstring (C++11)

Classes auxiliares 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)

 

Definido no cabeçalho <string>
float       stof(conststd::string& str, size_t *pos =0);	(1)	(desde C++11)
double      stod(conststd::string& str, size_t *pos =0);	(2)	(desde C++11)
longdouble stold(conststd::string& str, size_t *pos =0);	(3)	(desde C++11)

Interpreta um valor de ponto flutuante em um str cadeia.

Original:

Interprets a floating point value in a string str.

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Função descarta quaisquer caracteres em branco (como determinado pela std::isspace()) até que caráter não-primeiro espaço é encontrada. Em seguida, ele toma como caracteres possível para formar uma representação de ponto flutuante válido e os converte em valor de ponto flutuante. O valor de ponto flutuante válido pode ser um dos seguintes:

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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• expressão ponto decimal flutuante. Consiste nas seguintes partes:

  Original:

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

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• (opcional) mais ou de menos

  Original:

  (opcional) plus or minus sign

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• seqüência não vazia de dígitos decimais, opcionalmente contendo um caractere de ponto decimal (define significand)

  Original:

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

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• (opcional)e ou E seguiu com menos opcionais ou sinal de mais e não vazio seqüência de dígitos decimais (define expoente)

  Original:

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

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• binário expressão de ponto flutuante. Consiste nas seguintes partes:

  Original:

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

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• (opcional) mais ou de menos

  Original:

  (opcional) plus or minus sign

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• 0x or 0X
• seqüência não vazia de dígitos hexadecimais opcionalmente contendo um caractere de ponto decimal (define significand)

  Original:

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

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• (opcional)p ou P seguiu com menos opcionais ou sinal de mais e não vazio seqüência de dígitos hexadecimais (define expoente)

  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 expressão. Consiste nas seguintes partes:

  Original:

  infinity expression. It consists of the following parts:

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• (opcional) mais ou de menos

  Original:

  (opcional) plus or minus sign

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• INF ou INFINITY ignorando o caso

  Original:

  INF or INFINITY ignoring case

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• não-um número-expressão. Consiste nas seguintes partes:

  Original:

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

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• (opcional) mais ou de menos

  Original:

  (opcional) plus or minus sign

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• NAN ou NAN(' char_sequence ) ignorando o caso da parte NAN. Char_sequence' só pode conter caracteres alfanuméricos. O resultado é uma tranquila NaN valor de ponto flutuante.

  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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O índice do primeiro caractere não convertido é armazenado em pos. Se NULL é passada como pos, é ignorado.

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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Parâmetros

str	-	a string para converter 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 inteiro para armazenar o índice do primeiro caractere não convertido 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

A seqüência de convertidos para o tipo de ponto flutuante especificado.

Original:

The string converted to the specified floating point type.

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Exceções

std::invalid_argument se nenhuma conversão poderia ser realizada

Original:

std::invalid_argument if no conversion could be performed

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std::out_of_range se o valor convertido iria cair para fora do intervalo do tipo de resultado.

Original:

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

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Veja também

stoi stol stoll (C++11) (C++11) (C++11)	converte uma string para um inteiro assinado 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. (função)
stoul stoull (C++11) (C++11)	converte uma string para um inteiro sem sinal 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. (função)