compare_function.c

#include <stdio.h>

int scmp(const void *p1, const void *p2) {

  char *v1, *v2;
  v1 = *(char **) p1;
  v2 = *(char **) p2;

  return strcmp(v1, v2);
}

int main (int argc, const char * argv[])
{
  char *k1, *k2;
  k1 = "aaaaa";
  k2 = "abbbb";

  printf("%d", strcmp(k1, k2));

  return 0;
}