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std::wcstof, std::wcstod, std::wcstold – cppreference.com

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definiert in Header

<cwchar>

float wcstof( const wchar_t* str, wchar_t** str_end );

 (seit C++11)

double wcstod( const wchar_t* str, wchar_t** str_end );

long double wcstold( const wchar_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

    Original:

    (optional) plus or minus sign

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  • nichtleere Folge von Dezimalziffern gegebenenfalls ein Dezimalzeichen (definiert Mantisse)

    Original:

    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)

    Original:

    (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:

    Original:

    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)

    Original:

    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)

    Original:

    (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:

    Original:

    infinity expression. It consists of the following parts:

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  • (optional) Plus-oder Minuszeichen

    Original:

    (optional) plus or minus sign

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  • INF oder INFINITY ignorieren Fall

    Original:

    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_end NULL 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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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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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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Beispiel

Siehe auch