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    std::wcstof, std::wcstod, std::wcstold

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    < cpp‎ | string‎ | wide

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    C++
     
    Strings Bibliothek
    Null-terminierte Strings
    Original:
    Null-terminated strings
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    Byte-Strings
    Multibyte-Strings
    Wide Strings
    Classes
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    Classes
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    basic_string
    char_traits
     
    Nullterminierten Wide Strings
    Funktionen
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    Functions
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    Character Manipulation
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    Character manipulation
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    Umwandlungen in numerische Formate
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    Conversions to numeric formats
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    wcstof
    wcstod
    wcstold
    String-Manipulation
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    String manipulation
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    Array-Manipulation
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    Array manipulation
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    wmemcpy
    wmemmove
    wmemcmp
    wmemchr
    wmemset
     
    definiert in Header <cwchar>
    float       wcstof(constwchar_t* str, wchar_t** str_end );
    		(seit C++11)
    double      wcstod(constwchar_t* str, wchar_t** str_end );
    longdouble wcstold(constwchar_t* str, wchar_t** str_end );
    		(seit C++11)
    Legt einen Gleitkommawert in einem breiten String, auf den str .
    Original:
    Interprets a floating point value in a wide string pointed to by str.
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    Funktion verwirft alle Whitespace-Zeichen (wie std::isspace() bestimmt) bis zum ersten Nicht-Whitespace-Zeichen gefunden wird. Dann dauert es so viele Zeichen wie möglich, um eine gültige Gleitkomma-Darstellung bilden und wandelt sie in Fließkommazahl. Der gültige Gleitkommawert kann eine der folgenden sein:
    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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    • Gleitpunktberechnungen Ausdruck. Es besteht aus folgenden Teilen:
      Original:
      decimal floating point expression. It consists of the following parts:
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    • (optional) Plus-oder Minuszeichen
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      (optional) plus or minus sign
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    • nichtleere Folge von Dezimalziffern gegebenenfalls ein Dezimalzeichen (definiert Mantisse)
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      nonempty sequence of decimal digits optionally containing a decimal point character (defines significand)
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    • (optional)e oder E folgte mit optional Minus-oder Pluszeichen und nichtleere Folge von Dezimalziffern (definiert Exponent)
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      (optional)e or E followed with optional minus or plus sign and nonempty sequence of decimal digits (defines exponent)
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    • binäre Fließkomma-Ausdruck. Es besteht aus folgenden Teilen:
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      binary floating point expression. It consists of the following parts:
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    • (optional) Plus-oder Minuszeichen
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      (optional) plus or minus sign
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    • 0x or 0X
    • nichtleere Folge von Hexadezimalziffern gegebenenfalls ein Dezimalzeichen (definiert Mantisse)
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      nonempty sequence of hexadecimal digits optionally containing a decimal point character (defines significand)
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    • (optional)p oder P folgte mit optional Minus-oder Pluszeichen und nichtleere Folge von Hexadezimalziffern (definiert Exponent)
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      (optional)p or P followed with optional minus or plus sign and nonempty sequence of hexadecimal digits (defines exponent)
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    • infinity Ausdruck. Es besteht aus folgenden Teilen:
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      infinity expression. It consists of the following parts:
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    • (optional) Plus-oder Minuszeichen
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      (optional) plus or minus sign
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    • INF oder INFINITY ignorieren Fall
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      INF or INFINITY ignoring case
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    • not-a-number Ausdruck. Es besteht aus folgenden Teilen:
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      not-a-number expression. It consists of the following parts:
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    • (optional) Plus-oder Minuszeichen
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      (optional) plus or minus sign
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    • NAN oder NAN( char_sequence) ignorieren Fall des NAN Teil. Char_sequence kann nur alphanumerische Zeichen enthalten. Das Ergebnis ist ein ruhiger NaN Gleitkommawert .
      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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    Die Funktionen setzt den Zeiger auf die durch str_end auf die weite Zeichen nach dem letzten Zeichen interpretiert zeigen. Wenn str_endNULL ist, wird es ignoriert .
    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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    Inhaltsverzeichnis

    [Bearbeiten]Parameter

    str -
    Zeiger auf die null-terminierte breite Zeichenfolge interpretiert werden
    Original:
    pointer to the null-terminated wide string to be interpreted
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    str_end -
    Zeiger auf einen Zeiger auf eine breite Charakter .
    Original:
    pointer to a pointer to a wide character.
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    [Bearbeiten]Rückgabewert

    Floating-Point-Wert, der den Inhalt der str auf Erfolg. Wenn der umgewandelte Wert fällt außerhalb der Reichweite des zugehörigen Rückgabetyp tritt Entfernungsfehlers und HUGE_VAL, HUGE_VALF oder HUGE_VALL zurückgegeben. Wenn keine Umwandlung durchgeführt werden kann, wird zurückgegeben ​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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    [Bearbeiten]Beispiel

    This section is incomplete
    Reason: no example

    [Bearbeiten]Siehe auch

    C documentation for wcstof
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/string/wide/wcstof&oldid=30006“
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