std::strtoimax, std::strtoumax

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Terminadas en nulo de bytes

Funciones

De manipulación de caracteres

(C++11)

Las conversiones a formatos numéricos

strtof
strtod
strtold

Cadena de manipulación

Cadena examen

Memoria manipulación

Varios

Defined in header `<cinttypes>`

std::intmax_t strtoimax(const char* nptr, char** endptr, int base);		(ya que C + +11)

std::uintmax_t strtoumax(const char* nptr, char** endptr, int base);		(ya que C + +11)

Interpreta un valor entero en una cadena de bytes que apunta nptr .

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.

Las funciones establece el puntero que apunta endptr para que apunte al carácter allá del último carácter interpretado. Si endptr es NULL, se omite .

Si el nptr está vacía o no tiene la forma esperada, no se realiza la conversión, y (si es enptr no NULL) el valor de nptr se almacena en el objeto apuntado por endptr .

[editar] Parámetros

nptr	-	puntero a la cadena terminada en null byte debe ser interpretado Original: pointer to the null-terminated byte string to be interpreted The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
endptr	-	puntero a un puntero a caracter . Original: pointer to a pointer to character. The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
base	-	Base del valor entero interpretado Original: base of the interpreted integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

[editar] Valor de retorno

Si tiene éxito, un valor entero correspondiente al contenido de str se devuelve .
Original:
If successful, an integer value corresponding to the contents of str is returned.
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Si el valor convertido cae fuera del rango de tipo de retorno correspondiente, un error de rango se produce (ajuste errno a ERANGE) y INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX o 0 se devuelve, según proceda .
Original:
If the converted value falls out of range of corresponding return type, a range error occurs (setting errno to ERANGE) and INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX or 0 is returned, as appropriate.
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Si la conversión no se puede realizar, 0 se devuelve .
Original:
If no conversion can be performed, 0 is returned.
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[editar] Ejemplo

#include <iostream>
#include <string>
#include <cinttypes>
 
int main()
{
    std::string str = "helloworld";
    std::intmax_t val = std::strtoimax(str.c_str(), nullptr, 36);
    std::cout << str << " in base 36 is " << val << " in base 10\n";
 
    char* nptr;
    val = std::strtoimax(str.c_str(), &nptr, 30);
    if(nptr != &str[0] + str.size())
        std::cout << str << " in base 30 is invalid."
                  << " The first invalid digit is " << *nptr << '\n';
}

Output:

helloworld in base 36 is 1767707668033969 in base 10
helloworld in base 30 is invalid. The first invalid digit is w

[editar] Ver también


wcstoimax wcstoumax (C++11) (C++11)	convierte una cadena ancha para std::intmax_t o std::uintmax_t Original: converts a wide string to std::intmax_t or std::uintmax_t The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función) [edit]

strtol strtoll	convierte una cadena de bytes en un valor entero 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. (función) [edit]

strtoul strtoull	convierte una cadena de bytes en un valor entero sin signo Original: converts a byte string to an unsigned integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (función) [edit]

C documentation for strtoimax, strtoumax

Idioma
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Utilidades de la biblioteca
Strings biblioteca
Contenedores biblioteca
Algoritmos biblioteca
Los iteradores biblioteca
Numéricos biblioteca
Entrada / salida de la biblioteca
Localizaciones biblioteca
Expresiones biblioteca Regular (C++11)
Operaciones de biblioteca Atómica (C++11)
Tema Biblioteca de ayuda (C++11)

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