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std::stoi, std::stol, std::stoll

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< cpp‎ | string‎ | basic string

 
 
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
 
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)
 
Defined in header <string>
int       stoi( const std::string& str, size_t *pos = 0, int base = 10 );
(1) (seit C++11)
long      stol( const std::string& str, size_t *pos = 0, int base = 10 );
(2) (seit C++11)
long long stoll( const std::string& str, size_t *pos = 0, int base = 10 );
(3) (seit C++11)
Legt eine signierte Integer-Wert in der Zeichenfolge str .
Original:
Interprets a signed integer value in the string str.
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Function discards any whitespace characters until first non-whitespace character is found. Then it takes as many characters as possible to form a valid base-n (where n=base) integer number representation and converts them to an integer value. The valid integer value consists of the following parts:

  • (optional) plus or minus sign
  • (optional) prefix (0) indicating octal base (applies only when the base is 8)
  • (optional) prefix (0x or 0X) indicating hexadecimal base (applies only when the base is 16)
  • a sequence of digits

The set of valid digits for base-2 integer is 01, for base-3 integer is 012, and so on. For bases larger than 10, valid digits include alphabetic characters, starting from Aa for base-11 integer, to Zz for base-36 integer. The case of the characters is ignored.

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 einer Integer, um den Index des ersten umgesetzten Charakter
Original:
address of an integer to store the index of the first unconverted character
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base -
speichern. die Zahlenbasis
Original:
the number base
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[Bearbeiten] Rückgabewert

Die Zeichenfolge in die angegebene Ganzzahl konvertiert .
Original:
The string converted to the specified signed integer 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] Beispiel

#include <iostream>
#include <string>
 
int main()
{
    std::string test = "45";
    int myint = stoi(test);
    std::cout << myint << '\n';
}

Output:

45

[Bearbeiten] Siehe auch

wandelt ein Byte-String in einen ganzzahligen Wert
Original:
converts a byte string to an integer value
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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]
(C++11)
(C++11)
(C++11)
wandelt einen String in eine Gleitkommazahl
Original:
converts a string to an floating point value
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(Funktion) [edit]
(C++11)
wandelt ein integrierter oder Gleitkommawert string
Original:
converts an integral or floating point value to string
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(Funktion) [edit]