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

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< cpp‎ | string‎ | basic string

 
 
Strings biblioteca
Terminadas en nulo
Original:
Null-terminated strings
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Cadenas de bytes
Multibyte cuerdas
Cadenas anchas
Clases
Original:
Classes
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std::basic_string
Las funciones miembro
Original:
Member functions
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Elemento acceso
Original:
Element access
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Los iteradores
Original:
Iterators
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Capacidad
Original:
Capacity
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Operaciones
Original:
Operations
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Buscar
Original:
Search
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Constantes
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Constants
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Terceros funciones
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Non-member functions
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stoistolstoll
(C++11)(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)(C++11)
(C++11)
(C++11)
Clases de ayuda
Original:
Helper classes
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Definido en la cabecera <string>
int       stoi( const std::string& str, size_t *pos = 0, int base = 10 );
(1) (desde C++11)
long      stol( const std::string& str, size_t *pos = 0, int base = 10 );
(2) (desde C++11)
long long stoll( const std::string& str, size_t *pos = 0, int base = 10 );
(3) (desde C++11)
Interpreta un valor entero con signo en la cadena 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:

  • (opcional) plus or minus sign
  • (opcional) prefix (0) indicating octal base (applies only when the base is 8)
  • (opcional) 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.

El índice del carácter no convertido se almacena primero en pos. Si NULL se pasa como pos, se omite .
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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Contenido

[editar] Parámetros

str -
la cadena a convertir
Original:
the string to convert
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pos -
dirección de un número entero para almacenar el índice del carácter no convertido primero
Original:
address of an integer to store the index of the first unconverted character
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base -
la base numérica
Original:
the number base
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[editar] Valor de retorno

La cadena convertida al tipo entero con signo especificado .
Original:
The string converted to the specified signed integer type.
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[editar] Excepciones

  • std::invalid_argument si la conversión no se pudo realizar
    Original:
    std::invalid_argument if no conversion could be performed
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  • std::out_of_range si el valor convertido caerían fuera de la gama del tipo del resultado .
    Original:
    std::out_of_range if the converted value would fall out of the range of the result type.
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[editar] Ejemplo

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

Salida:

45

[editar] Ver también

convierte una cadena de bytes en un valor entero
Original:
converts a byte string to an integer value
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(función) [editar]
(C++11)(C++11)
convierte una cadena a un entero sin signo
Original:
converts a string to an unsigned integer
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(función) [editar]
(C++11)(C++11)(C++11)
convierte una cadena en un valor de coma flotante
Original:
converts a string to an floating point value
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(función) [editar]
(C++11)
Convierte un valor de coma flotante o integral a string
Original:
converts an integral or floating point value to string
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(función) [editar]