C Sort Array of Struct

main.c

#include <stdio.h>
#include <stdlib.h>

typedef struct {
		char a;
		char b;
	} s;

int comp (const s *a, const s *b) {
	return a->a > b->a || a->b < b->b ? -1 : 1;
}

int main (void) {
	s arr[] = {
		{5, 5}, {6, 2}, {2, 7}, {5, 2}, {1, 0}, {5, 1}, {6, 1}, {2, 9}
	};

	qsort(&arr, sizeof(arr) / sizeof(s), sizeof(s), (int (*) (const void *, const void *)) &comp);

	for (int i=0; i < sizeof(arr) / sizeof(s); i++) {
		printf("{%d, %d}\n", arr[i].a, arr[i].b);
	}

    return 0;
}