typedef int nat;

typedef struct {
	nat id;
	char *data;
	} element_struct;

typedef element_struct * element;

void push(element e, queue s) {
	nat lt = s->length;
	nat bk = s->back;
	if (lt == max_length) {
		printf("Error in push: Queue is full.\n");
		return;
	}
	else if (bk == max_length - 1) {
		s->back = 0;
		s->contents[s->back] = e;
		s->length = lt + 1;
	}
	else {
		s->back = bk + 1;
		s->contents[lt] = e;
		s->length = lt + 1;
	}
}

int main () {
	element_struct push1 = {1, "bar"};
	push(&push1, s);

	return 0;
}