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std::atoi, std::atol, std::atoll

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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atof
atoi
atol
atoll
strtol
strtoll
La manipulation de chaînes
Original:
String manipulation
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strcpy
strncpy
strcat
strncat
strxfrm
Examen chaîne
Original:
String examination
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Manipulation de la mémoire
Original:
Memory manipulation
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memchr
memcmp
memset
memcpy
memmove
Divers
Original:
Miscellaneous
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strerror
 
Defined in header <cstdlib>
int       atoi( const char *str );
long      atol( const char *str )
long long atoll( const char *str );
(depuis C++11)
Interpréter une valeur entière dans une chaîne d'octets pointée par str .
Original:
Interprets an integer value in a byte string pointed to by str.
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Fonction supprime les caractères blancs jusqu'au premier caractère non-blanc est trouvé. Ensuite, il faut autant de caractères que possible pour former une représentation valable nombre entier et les convertit en valeur entière. La valeur valide entier se compose des parties suivantes:
Original:
Function discards any whitespace characters until first non-whitespace character is found. Then it takes as many characters as possible to form a valid integer number representation and converts them to integer value. The valid integer value consists of the following parts:
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  • (en option) signe plus ou moins
    Original:
    (en option) plus or minus sign
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  • caractères numériques
    Original:
    numeric digits
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Sommaire

[modifier] Paramètres

str -
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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[modifier] Retourne la valeur

Valeur entière correspondant au contenu de str en cas de succès. Si la valeur convertie tombe hors de portée du type de retour correspondante, la valeur de retour est indéfinie. Si aucune conversion peut être effectuée, 0 est retourné .
Original:
Integer value corresponding to the contents of str on success. If the converted value falls out of range of corresponding return type, the return value is undefined. If no conversion can be performed, 0 is returned.
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[modifier] Exemple

#include <iostream>
#include <cstdlib>
 
int main()
{
    const char *str1 = "42";
    const char *str2 = "3.14159";
    const char *str3 = "31337 with words";
    const char *str4 = "words and 2";
 
    int num1 = std::atoi(str1);
    int num2 = std::atoi(str2);
    int num3 = std::atoi(str3);
    int num4 = std::atoi(str4);
 
    std::cout << "std::atoi(\"" << str1 << "\") is " << num1 << '\n';
    std::cout << "std::atoi(\"" << str2 << "\") is " << num2 << '\n';
    std::cout << "std::atoi(\"" << str3 << "\") is " << num3 << '\n';
    std::cout << "std::atoi(\"" << str4 << "\") is " << num4 << '\n';
}

Résultat :

std::atoi("42") is 42
std::atoi("3.14159") is 3
std::atoi("31337 with words") is 31337
std::atoi("words and 2") is 0

[modifier] Voir aussi

(C++11)
(C++11)
(C++11)
convertit une chaîne en un entier signé
Original:
converts a string to an signed integer
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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 atoi, atol, atoll