std::atoi, std::atol, std::atoll
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| Déclaré dans l'en-tête <cstdlib>
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| int atoi( const char *str ); |
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| long atol( const char *str ) |
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| 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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
You can help to correct and verify the translation. Click here for instructions.
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:
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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- (en option) signe plus ou moinsOriginal:(en option) plus or minus signThe text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - caractères numériquesOriginal:numeric digitsThe text has been machine-translated via Google Translate.
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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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) |
| convertit une chaîne d'octets en une valeur entière Original: converts a byte string to an integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) | |
| convertit une chaîne d'octets à une valeur d'entier non signé Original: converts a byte string to an unsigned integer value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction) | |
| C documentation for atoi, atol, atoll
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