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

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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)

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hash<std::string> hash<std::wstring> hash<std::u32string> hash<std::u16string> (C++11)

 

<tbody> </tbody>

definiert 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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Parameter

str	-	die Zeichenfolge zu konvertieren Original: the string to convert The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
base	-	speichern. die Zahlenbasis Original: the number base The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Rückgabewert

Die Zeichenfolge in die angegebene Ganzzahl konvertiert .

Original:

The string converted to the specified signed integer type.

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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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Beispiel

#include <iostream>
#include <string>

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

Output:

45

Siehe auch

atoi atol atoll	wandelt ein Byte-String in einen ganzzahligen Wert Original: converts a byte string to an integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion)
stoul stoull (C++11) (C++11)	wandelt einen String in eine Ganzzahl ohne Vorzeichen Original: converts a string to an unsigned integer The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion)
stof stod stold (C++11) (C++11) (C++11)	wandelt einen String in eine Gleitkommazahl Original: converts a string to an floating point value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion)
to_string (C++11)	wandelt ein integrierter oder Gleitkommawert string Original: converts an integral or floating point value to string The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion)