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

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Definido no cabeçalho `<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 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
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(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
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(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


	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) [edit]

	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) [edit]