#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
static int cmp(void const *p, void const *q);
 
int main(void)
{
   char *pal[] = {
      "xyz",
      "paco",
      "luis",
      "hugo",
      "abc",
   };
   size_t num_pals = sizeof pal / sizeof pal[0];
   size_t i;
 
   qsort(pal, num_pals, sizeof pal[0], cmp);
   for (i = 0; i < num_pals; i++)
      printf("%lu: %s\n", (unsigned long) i, pal[i]);
 
   return EXIT_SUCCESS;
}
 
static int cmp(void const *p, void const *q)
{
   return strcmp(*(char **) p, *(char **) q);
}