Espaces de noms
Variantes
Affichages
Actions

qsort

De cppreference.com
< c‎ | algorithm

This page has been machine-translated from the English version of the wiki using Google Translate.

The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here.

Click here for the English version of this page

 
C
 
Algorithmes
 
Déclaré dans l'en-tête <stdlib.h>
void qsort( const void *ptr, size_t count, size_t size,
            int (*comp)(const void *, const void *) );
Trie le tableau donné pointé par ptr dans l'ordre croissant. Le tableau contient des éléments count de size taille. Fonction pointée par comp est utilisé pour la comparaison d'objets .
Original:
Sorts the given array pointed to by ptr in ascending order. The array contains count elements of size size. Function pointed to by comp is used for object comparison.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Sommaire

[modifier] Paramètres

ptr -
pointeur vers le tableau à trier
Original:
pointer to the array to sort
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
count -
nombre d'éléments dans le tableau
Original:
number of element in the array
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
size -
taille de chaque élément dans le tableau en octets
Original:
size of each element in the array in bytes
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
comp - comparison function which returns ​a negative integer value if the first argument is less than the second,

a positive integer value if the first argument is greater than the second and zero if the arguments are equal.
The signature of the comparison function should be equivalent to the following:

 int cmp(const void *a, const void *b);

The function must not modify the objects passed to it.

​

[modifier] Retourne la valeur

(Aucun)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[modifier] Exemple

Le code suivant trie un tableau d'entiers en utilisant qsort()
Original:
The following code sorts an array of integers using qsort()
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <stdio.h>
#include <stdlib.h>
 
int compare_ints(const void* a, const void* b)
{
    const int *arg1 = a;
    const int *arg2 = b;
 
    return *arg1 - *arg2;
}
 
int main(void)
{
    int i;
    int ints[] = { -2, 99, 0, -743, 2, 3, 4 };
    int size = sizeof ints / sizeof *ints;
 
    qsort(ints, size, sizeof(int), compare_ints);
 
    for (i = 0; i < size; i++) {
        printf("%d ", ints[i]);
    }
 
    printf("\n");
 
    return EXIT_SUCCESS;
}

Résultat : 

-743 -2 0 2 3 4 99

[modifier] Voir aussi
recherche un tableau pour un élément de type non spécifié
Original:
searches an array for an element of unspecified type
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(fonction) [edit]
C++ documentation for qsort
Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=c/algorithm/qsort&oldid=47110 »