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std::stof, std::stod, std::stold

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< cpp‎ | string‎ | basic string

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C++
 
Strings Bibliothek
Null-terminierte Strings
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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
 
std::basic_string
Member-Funktionen
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Member functions
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basic_string::basic_string
basic_string::operator=
basic_string::assign
basic_string::get_allocator
Elementzugriff zerstört
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Element access
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basic_string::at
basic_string::operator[]
basic_string::front(C++11)
basic_string::back(C++11)
basic_string::data
basic_string::c_str
Iteratoren
Original:
Iterators
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basic_string::begin
basic_string::cbegin
(C++11)
basic_string::end
basic_string::cend
(C++11)
basic_string::rbegin
basic_string::crbegin
(C++11)
basic_string::rend
basic_string::crend
(C++11)
Kapazität
Original:
Capacity
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basic_string::empty
basic_string::size
basic_string::length
basic_string::max_size
basic_string::reserve
basic_string::capacity
basic_string::shrink_to_fit(C++11)
Operations
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Operations
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basic_string::clear
basic_string::insert
basic_string::erase
basic_string::push_back
basic_string::pop_back(C++11)
basic_string::append
basic_string::operator+=
basic_string::compare
basic_string::replace
basic_string::substr
basic_string::copy
basic_string::resize
basic_string::swap
Suchen
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Search
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basic_string::find
basic_string::rfind
basic_string::find_first_of
basic_string::find_first_not_of
basic_string::find_last_of
basic_string::find_last_not_of
Konstanten
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Constants
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basic_string::npos
Non-Member-Funktionen
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Non-member functions
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operator+
operator==
operator!=
operator<
operator>
operator<=
operator>=
swap(std::basic_string)
operator<<
operator>>
getline
stoi
stol
stoll		(C++11)
(C++11)
(C++11)
stoul
stoull		(C++11)
(C++11)
stof
stod
stold		(C++11)
(C++11)
(C++11)
to_string(C++11)
to_wstring(C++11)
Helper-Klassen
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Helper classes
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hash<std::string>
hash<std::wstring>
hash<std::u32string>
hash<std::u16string>		(C++11)
 
definiert in Header <string>
float       stof( const std::string& str, size_t *pos = 0 );
 (1) (seit C++11)
double      stod( const std::string& str, size_t *pos = 0 );
 (2) (seit C++11)
long double stold( const std::string& str, size_t *pos = 0 );
 (3) (seit C++11)
Legt einen Gleitkommawert in einen String str .
Original:
Interprets a floating point value in a string 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:
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    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)
    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)
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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:
    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:
    Original:
    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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Der Index des ersten umgesetzten Zeichen wird in pos gespeichert. Wenn NULL als pos übergeben wird, wird es ignoriert .
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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Inhaltsverzeichnis

[Bearbeiten] Parameter

str -
die Zeichenfolge zu konvertieren
Original:
the string to convert
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pos -
Adresse des ganzzahligen den Index des ersten umgesetzten Charakter zu speichern
Original:
address of integer to store the index of the first unconverted character
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[Bearbeiten] Rückgabewert

Die Zeichenfolge in die angegebene Gleitkommazahl konvertiert .
Original:
The string converted to the specified floating point type.
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[Bearbeiten] Ausnahmen

std::invalid_argument wenn keine Konvertierung durchgeführt werden konnten
Original:
std::invalid_argument if no conversion could be performed
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std::out_of_range wenn der konvertierte Wert würde fallen aus dem Bereich der Ergebnis-Typ .
Original:
std::out_of_range if the converted value would fall out of the range of the result type.
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[Bearbeiten] Siehe auch

(C++11)
(C++11)
(C++11)
wandelt einen String in eine Ganzzahl
Original:
converts a string to an signed integer
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(Funktion) [edit]
(C++11)
(C++11)
wandelt einen String in eine Ganzzahl ohne Vorzeichen
Original:
converts a string to an unsigned integer
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(Funktion) [edit]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/string/basic_string/stof&oldid=29955“