Varianti

    std::strtoimax, std::strtoumax

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    <metanoindex/>

     
    C++
     
    Stringhe libreria
    Null-stringhe terminate
    Original:
    Null-terminated strings
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    Byte stringhe
    Multibyte stringhe
    Stringhe larghe
    Classi
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    Classes
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    basic_string
    char_traits
     
    Null-stringhe terminate byte
    Funzioni
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    Functions
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    Carattere manipolazione
    Original:
    Character manipulation
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    Le conversioni in formati numerici
    Original:
    Conversions to numeric formats
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    Della gestione delle stringhe
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    String manipulation
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    strcpy
    strncpy
    strcat
    strncat
    strxfrm
    String esame
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    String examination
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    Memoria manipolazione
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    Memory manipulation
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    memchr
    memcmp
    memset
    memcpy
    memmove
    Varie
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    Miscellaneous
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    strerror
     
    <tbody> </tbody>
    Elemento definito nell'header <cinttypes>
    std::intmax_t strtoimax(const char* nptr, char** endptr, int base);
    		 (dal C++11)
    std::uintmax_t strtoumax(const char* nptr, char** endptr, int base);
    		 (dal C++11)
    Interpreta un valore intero in una stringa di byte puntato da 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:

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

    Le funzioni imposta il puntatore puntato da endptr per puntare al carattere dopo l'ultimo carattere interpretato. Se endptr è NULL, viene ignorato.
    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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    Se il nptr è vuoto o non ha la forma prevista, la conversione non viene eseguita, e (se non è enptr NULL) il valore di nptr è memorizzato nell'oggetto puntato da 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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    Parametri

    nptr -
    puntatore alla stringa con terminazione null byte da interpretare
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    pointer to the null-terminated byte string to be interpreted
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    endptr -
    puntatore a un puntatore a carattere .
    Original:
    pointer to a pointer to character.
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    base -
    Base del valore intero interpretato
    Original:
    base of the interpreted integer value
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    Valore di ritorno

    • In caso di successo, un valore intero corrispondente al contenuto di str viene restituito.
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      If successful, an integer value corresponding to the contents of str is returned.
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    • Se il valore convertito cade fuori dalla portata del tipo di ritorno corrispondente, si verifica un errore di campo (impostazione errno a ERANGE) e INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX o 0 viene restituito, a seconda dei casi.
      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 la conversione non può essere eseguita, viene restituito 0.
      Original:
      If no conversion can be performed, 0 is returned.
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    Esempio

    #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

    Vedi anche

    (C++11)
    (C++11)
    converte una stringa bersaglio std::intmax_t o std::uintmax_t
    Original:
    converts a wide string to std::intmax_t or std::uintmax_t
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    (funzione) [modifica]
    converte una stringa di byte in un valore intero
    Original:
    converts a byte string to an integer value
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    (funzione) [modifica]
    converte una stringa di byte in un valore intero senza segno
    Original:
    converts a byte string to an unsigned integer value
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    (funzione) [modifica]
    C documentation for strtoimax, strtoumax