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std::strtoimax, std::strtoumax

De cppreference.com
< cpp‎ | string‎ | byte

 
 
Strings biblioteca
Terminadas en nulo
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Null-terminated strings
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Cadenas de bytes
Multibyte cuerdas
Cadenas anchas
Clases
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Classes
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basic_string
char_traits
 
Terminadas en nulo de bytes
Funciones
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Functions
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De manipulación de caracteres
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Character manipulation
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Las conversiones a formatos numéricos
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Conversions to numeric formats
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Cadena de manipulación
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Cadena examen
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String examination
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Memoria manipulación
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Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Varios
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Miscellaneous
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strerror
 
Defined in header <cinttypes>
std::intmax_t strtoimax(const char* nptr, char** endptr, int base);
(desde C++11)
std::uintmax_t strtoumax(const char* nptr, char** endptr, int base);
(desde C++11)
Interpreta un valor entero en una cadena de bytes que apunta nptr .
Original:
Interprets an integer value in a byte string pointed to by nptr.
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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.

Las funciones establece el puntero que apunta endptr para que apunte al carácter allá del último carácter interpretado. Si endptr es NULL, se omite .
Original:
The functions sets the pointer pointed to by endptr to point to the character past the last character interpreted. If endptr is NULL, it is ignored.
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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 .
Original:
If the nptr is empty or does not have the expected form, no conversion is performed, and (if enptr is not NULL) the value of nptr is stored in the object pointed to by endptr.
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Contenido

[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
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endptr -
puntero a un puntero a caracter .
Original:
pointer to a pointer to character.
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base -
Base del valor entero interpretado
Original:
base of the interpreted integer value
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[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 [[cpp/error/errno|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 [[cpp/error/errno|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

(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
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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 strtoimax, strtoumax