std::stoi, std::stol, std::stoll – cppreference.com

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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:

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) [edit]

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) [edit]

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) [edit]

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) [edit]