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

The strict version of a comparator takes two constant void pointers:

int compare(const void *v1, const void *v2)
{
    const struct profile *p1 = v1;
    const struct profile *p2 = v2;
    if (p1->gender > p2->gender)
        return(+1);
    else if (p1->gender < p2->gender)
        return(-1);
    else if (p1->soc > p2->soc)
        return(+1);
    else if (p1->soc < p2->soc)
        return(-1);
    else
        return(0);
}

This compares the gender field first, then the soc field. This is how you handle any multipart comparison.