qsort function - trying to use a comparator

Question

I made a qsort function for a larger program. It is to sort by time. I have a class schedule I am working with and found a need to compare time with AM and PM. ie if A is chosen

Answer 1

Assuming you have a function greaterThan, you can implement sortFunction as follows:

int sortFunction(const void *p, const void *q) {
    if (greaterThan(p, q)) { // p > q
        return +1;
    } else if (greaterThan(q, p)) { // p < q
        return -1;
    } else { // p == q
        return  0;
    }
}