Need help using qsort with an array of structs

Question

Now, I have seen various examples, but I don\'t get what they mean.

Here\'s my structure

typedef struct profile{
    char gender[1];
    double soc;
         


        

Answer 1

Your Soc should almost certainly not be of type double, but anyway here's an example of what a compare function needs to return:

int compare(const void *p1, const void *p2)
{
    const struct profile *elem1 = p1;    
    const struct profile *elem2 = p2;

   if (elem1->soc < elem2->soc)
      return -1;
   else if (elem1->soc > elem2->soc)
      return 1;
   else
      return 0;
}

Thanks for pointing out the const void *.

Here is a complete example (archived): Sorting Structures with the C qsort() Function