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std::strtoimax, std::strtoumax

De cppreference.com
< cpp‎ | string‎ | byte

 
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
Original:
Null-terminated strings
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Les chaînes d'octets
Chaines multi-octets
Les chaînes étendues
Classes
Original:
Classes
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basic_string
char_traits
 
Chaînes d'octets à zéro terminal
Fonctions
Original:
Functions
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Manipulation caractère
Original:
Character manipulation
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Conversion aux formats numériques
Original:
Conversions to numeric formats
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La manipulation de chaînes
Original:
String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Examen chaîne
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String examination
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Manipulation de la mémoire
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Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Divers
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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);
(depuis C++11)
std::uintmax_t strtoumax(const char* nptr, char** endptr, int base);
(depuis C++11)
Interpréter une valeur entière dans une chaîne d'octets pointée par 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:

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

Les fonctions définit le pointeur pointé par endptr pour pointer vers le caractère passé le dernier caractère interprété. Si endptr est NULL, il est ignoré .
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 le nptr est vide ou n'a pas la forme attendue, aucune conversion n'est effectuée, et (si enptr n'est pas NULL) la valeur de nptr est stockée dans l'objet pointé par 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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Sommaire

[modifier] Paramètres

nptr -
pointeur vers la chaîne d'octets terminée par NULL doit être interprété
Original:
pointer to the null-terminated byte string to be interpreted
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endptr -
pointeur vers un pointeur sur caractère .
Original:
pointer to a pointer to character.
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base -
Base de la valeur entière interprété
Original:
base of the interpreted integer value
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[modifier] Retourne la valeur

  • En cas de succès, une valeur entière correspondant au contenu de str est retourné .
    Original:
    If successful, an integer value corresponding to the contents of str is returned.
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  • Si la valeur convertie tombe hors de la plage de type de retour correspondante, une erreur d'intervalle se produit ([[cpp/error/errno|errno]] réglage de ERANGE) et INTMAX_MAX, INTMAX_MIN, UINTMAX_MAX ou 0 est renvoyée, le cas échéant .
    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 aucune conversion peut être effectuée, 0 est retourné .
    Original:
    If no conversion can be performed, 0 is returned.
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[modifier] Exemple

#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';
}

Résultat :

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

[modifier] Voir aussi

(C++11)
(C++11)
convertit une chaîne large de std::intmax_t ou std::uintmax_t
Original:
converts a wide string to std::intmax_t or std::uintmax_t
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(fonction) [edit]
convertit une chaîne d'octets en une valeur entière
Original:
converts a byte string to an integer value
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(fonction) [edit]
convertit une chaîne d'octets à une valeur d'entier non signé
Original:
converts a byte string to an unsigned integer value
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(fonction) [edit]
C documentation for strtoimax, strtoumax