How to return a specific element within an array?

Question

I’m trying to return the largest among 4 numbers, for this I’m using the function qsort() available on <stdlib.h>. Follows the code:

 int comparison (const void *a, const void *b){
        if (*(int*)a == (*(int*)b)){
            return 0;
        }
        if (*(int*)a > (*(int*)b)){
            return 1;
        } else {
            return -1;
        }
    }

    int max_of_four(int a, int b, int c, int d){
        int vector[4] = {a, b, c, d};
        qsort(vector, 4, sizeof(int), comparison);
        return
    }

    int main() {
        int a, b, c, d;
        scanf("%d %d %d %d", &a, &b, &c, &d);
        int ans = max_of_four(a, b, c, d);
        printf("%d", ans);


        return 0;
    }

Has a return open there, as I do to return the last element of my array vector now ordered? Would you have some way to do that same function for an unlimited number of numbers instead of 4?

Answer 1

Would this be:

return vector[3];

which is the last element of this array (since it starts at 0).

I put in the Github for future reference.

If the quantity is variable then you have to take the amount of constant items in the vector. There you can already pass an array or a list of items (rarely a good one). If you want to receive a variable list of arguments you can see more or less how to do in Scanf function with variable amount of parameters, how to implement? (another example).