Espacios de nombres
Variantes
Acciones

std::atoi, std::atol, std::atoll

De cppreference.com
< cpp‎ | string‎ | byte

 
 
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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basic_string
char_traits
 
Terminadas en nulo de bytes
Funciones
Original:
Functions
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De manipulación de caracteres
Original:
Character manipulation
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Las conversiones a formatos numéricos
Original:
Conversions to numeric formats
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atof
atoi
atol
atoll
strtol
strtoll
Cadena de manipulación
Original:
String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Cadena examen
Original:
String examination
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Memoria manipulación
Original:
Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Varios
Original:
Miscellaneous
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strerror
 
Defined in header <cstdlib>
int       atoi( const char *str );
long      atol( const char *str )
long long atoll( const char *str );
(desde C++11)
Interpreta un valor entero en una cadena de bytes que apunta str .
Original:
Interprets an integer value in a byte string pointed to by str.
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Función descarta los espacios en blanco hasta que primero no está en blanco se encuentra. Luego se toma como caracteres posible para formar una representación válida número entero y los convierte a un valor entero. El valor entero válido consiste de las siguientes partes:
Original:
Function discards any whitespace characters until first non-whitespace character is found. Then it takes as many characters as possible to form a valid integer number representation and converts them to integer value. The valid integer value consists of the following parts:
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  • (opcional) más o el signo menos
    Original:
    (opcional) plus or minus sign
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  • dígitos numéricos
    Original:
    numeric digits
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Contenido

[editar] Parámetros

str -
puntero a la cadena terminada en null byte debe ser interpretado
Original:
pointer to the null-terminated byte string to be interpreted
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[editar] Valor de retorno

Valor entero correspondiente al contenido de str en caso de éxito. Si el valor convertido cae fuera del rango de tipo de retorno correspondiente, el valor de retorno es indefinido. Si la conversión no se puede realizar, 0 se devuelve .
Original:
Integer value corresponding to the contents of str on success. If the converted value falls out of range of corresponding return type, the return value is undefined. If no conversion can be performed, 0 is returned.
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[editar] Ejemplo

#include <iostream>
#include <cstdlib>
 
int main()
{
    const char *str1 = "42";
    const char *str2 = "3.14159";
    const char *str3 = "31337 with words";
    const char *str4 = "words and 2";
 
    int num1 = std::atoi(str1);
    int num2 = std::atoi(str2);
    int num3 = std::atoi(str3);
    int num4 = std::atoi(str4);
 
    std::cout << "std::atoi(\"" << str1 << "\") is " << num1 << '\n';
    std::cout << "std::atoi(\"" << str2 << "\") is " << num2 << '\n';
    std::cout << "std::atoi(\"" << str3 << "\") is " << num3 << '\n';
    std::cout << "std::atoi(\"" << str4 << "\") is " << num4 << '\n';
}

Output:

std::atoi("42") is 42
std::atoi("3.14159") is 3
std::atoi("31337 with words") is 31337
std::atoi("words and 2") is 0

[editar] Ver también

(C++11)
(C++11)
(C++11)
convierte una cadena a un entero con signo
Original:
converts a string to an signed integer
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(función) [edit]
convierte una cadena de bytes en un valor entero
Original:
converts a byte string to an integer value
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(función) [edit]
convierte una cadena de bytes en un valor entero sin signo
Original:
converts a byte string to an unsigned integer value
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(función) [edit]
C documentation for atoi, atol, atoll