函数指针

 1 #include <stdio.h>
 2 
 3 int compare (const void * a, const void * b)
 4 {
 5     return *(int *)a - *(int *)b;
 6 }
 7 int main (void)
 8 {
 9     int arr[15] = {999, 23, 39, 23, 199, 1, 23, -432, 1, 0, 23, -32, 235, 13, 2};
10 
11     int i;
12     for (i = 0; i < 15; i++)
13     {
14         printf ("%5d ", arr[i]);
15     }
16     printf ("\n");
17 
18     qsort (arr, 15, sizeof (int), compare);
19 
20     for (i = 0; i < 15; i++)
21     {
22         printf ("%5d ", arr[i]);
23     }
24     printf ("\n");
25 }