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wcstof, wcstod, wcstold

De cppreference.com
< c‎ | string‎ | wide

 
 
 
Terminadas en nulo de ancho
Funciones
Original:
Functions
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De manipulación de caracteres
Original:
Character manipulation
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Las conversiones a formatos numéricos
Original:
Conversions to numeric formats
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wcstof
wcstod
wcstold
Cadena de manipulación
Original:
String manipulation
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Matriz de manipulación
Original:
Array manipulation
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wmemcpy
wmemmove
wmemcmp
wmemchr
wmemset
 
Defined in header <wchar.h>
float       wcstof( const wchar_t* str, wchar_t** str_end );
double      wcstod( const wchar_t* str, wchar_t** str_end );
long double wcstold( const wchar_t* str, wchar_t** str_end );
Interpreta un valor de punto flotante en una cadena ancha apuntado por str .
Original:
Interprets a floating point value in a wide string pointed to by 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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Las funciones establece el puntero que apunta al punto str_end al carácter ancho allá del último carácter interpretado. Si str_end es NULL, se omite .
Original:
The functions sets the pointer pointed to by str_end to point to the wide character past the last character interpreted. If str_end is NULL, it is ignored.
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Contenido

[editar] Parámetros

str -
puntero a la cadena terminada en cero de ancho para ser interpretada
Original:
pointer to the null-terminated wide string to be interpreted
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str_end -
puntero a un puntero a un carácter ancho .
Original:
pointer to a pointer to a wide character.
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[editar] Valor de retorno

Flotando valor del punto correspondiente al contenido de str en caso de éxito. Si el valor convertido cae fuera del rango del tipo de cambio correspondiente, se produce error de rango y HUGE_VAL, HUGE_VALF o HUGE_VALL devuelve. Si la conversión no se puede realizar, 0 se devuelve .
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] Ejemplo

[editar] Ver también

C++ documentation for wcstof, wcstod, wcstold