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qsort

Da cppreference.com
< c‎ | algorithm

Defined in header <stdlib.h>
void qsort( const void *ptr, size_t count, size_t size,
            int (*comp)(const void *, const void *) );
Classifica a matriz dado apontado por ptr em ordem crescente. A matriz contém elementos count de size tamanho. Função apontada pelo comp é usado para comparação de objetos.
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.
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Índice

[editar] Parâmetros

ptr -
ponteiro para a matriz para classificar
Original:
pointer to the array to sort
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count -
número de elementos na matriz
Original:
number of element in the array
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size -
tamanho de cada elemento na matriz em bytes
Original:
size of each element in the array in bytes
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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.

[editar] Valor de retorno

(Nenhum)
Original:
(none)
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[editar] Exemplo

Os tipos de código a seguir um array de inteiros usando qsort()
Original:
The following code sorts an array of integers using qsort()
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#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;
}

Output:

-743 -2 0 2 3 4 99

[editar] Veja também

procura uma matriz para um elemento de tipo não especificado
Original:
searches an array for an element of unspecified type
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(função) [edit]