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std::strtoimax, std::strtoumax

Da cppreference.com
< cpp‎ | string‎ | byte

 
 
Biblioteca cordas
Strings terminadas
Original:
Null-terminated strings
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Cadeias de bytes
Multibyte cordas
Cordas de largura
Classes
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Classes
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basic_string
char_traits
 
Cordas de terminação nula de bytes
Funções
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Functions
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Manipulação personagem
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Character manipulation
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Conversões para formatos numéricos
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Conversions to numeric formats
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Manipulação de cadeia
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String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Exame String
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String examination
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Manipulação de memória
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Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Diversos
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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);
(a partir do C++ 11)
std::uintmax_t strtoumax(const char* nptr, char** endptr, int base);
(a partir do C++ 11)
Interpreta um valor inteiro em uma seqüência de bytes apontado por 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.

As funções define o ponteiro apontado pelo endptr para apontar para o caráter passado o último personagem interpretado. Se endptr é NULL, ele é ignorado.
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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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Se o nptr está vazia ou não tem a forma esperada, nenhuma conversão é realizada, e (se não é enptr NULL) o valor de nptr é armazenado no objeto apontado por endptr.
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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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Índice

[editar] Parâmetros

nptr -
ponteiro para o byte string terminada em nulo para ser interpretado
Original:
pointer to the null-terminated byte string to be interpreted
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endptr -
ponteiro para um ponteiro para caracter .
Original:
pointer to a pointer to character.
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base -
Base do valor inteiro interpretado
Original:
base of the interpreted integer value
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[editar] Valor de retorno

  • Se for bem sucedido, um valor inteiro correspondente ao conteúdo do str é retornado.
    Original:
    If successful, an integer value corresponding to the contents of str is returned.
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  • Se o valor convertido cai fora do alcance do tipo de retorno correspondente, ocorre um erro de gama (configuração errno para ERANGE) e INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX ou 0 é devolvido, conforme o caso.
    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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  • Se nenhuma conversão pode ser executada, é devolvido 0.
    Original:
    If no conversion can be performed, 0 is returned.
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[editar] Exemplo

#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] Veja também

(C++11)
(C++11)
converte uma cadeia de largura para std::intmax_t ou std::uintmax_t
Original:
converts a wide string to std::intmax_t or std::uintmax_t
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(função) [edit]
converte uma seqüência de byte para um valor inteiro
Original:
converts a byte string to an integer value
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(função) [edit]
converte uma seqüência de byte para um valor inteiro sem sinal
Original:
converts a byte string to an unsigned integer value
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(função) [edit]
C documentation for strtoimax, strtoumax