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strtof, strtod, strtold

Da cppreference.com
< c‎ | string‎ | byte

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C
 
Biblioteca cordas
 
Cordas de terminação nula de bytes
Funções
Original:
Functions
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Manipulação personagem
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Character manipulation
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Conversões para formatos numéricos
Original:
Conversions to numeric formats
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strtofstrtodstrtold
Manipulação de cadeia
Original:
String manipulation
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Exame String
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String examination
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Manipulação de memória
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Memory manipulation
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Diversos
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Miscellaneous
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Definido no cabeçalho <stdlib.h>
float       strtof( const char* str, char** str_end );
double      strtod( const char* str, char** str_end );
long double strtold( const char* str, char** str_end );
Interpreta um valor de ponto flutuante em uma seqüência de bytes apontado por str.
Original:
Interprets a floating point value in a byte string pointed to by 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
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    (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
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    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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As funções define o ponteiro apontado pelo str_end para apontar para o caráter passado o último personagem interpretado. Se str_end é NULL, ele é ignorado.
Original:
The functions sets the pointer pointed to by str_end to point to the character past the last character interpreted. If str_end is NULL, it is ignored.
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Índice

[editar] Parâmetros

str -
ponteiro para o byte string terminada em nulo para ser interpretado
Original:
pointer to the null-terminated byte string to be interpreted
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str_end -
ponteiro para um ponteiro para caracter .
Original:
pointer to a pointer to character.
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[editar] Valor de retorno

Flutuando valor do ponto correspondente ao conteúdo do str em caso de sucesso. Se o valor convertido cai fora do alcance do tipo de retorno correspondente, o erro ocorre e intervalo HUGE_VAL, HUGE_VALF ou HUGE_VALL é devolvido. Se nenhuma conversão pode ser executada, é devolvido ​0​.
Original:
Floating point value corresponding to the contents of str on success. If the converted value falls out of range of corresponding return type, range error occurs and HUGE_VAL, HUGE_VALF or HUGE_VALL is returned. If no conversion can be performed, ​0​ is returned.
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[editar] Exemplo

Esta seção está incompleta
Motivo: sem exemplo

[editar] Veja também
converte uma seqüência de byte para um valor de ponto flutuante
Original:
converts a byte string to a floating point value
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(função) [edit]
C++ documentation for strtof, strtod, strtold
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