for (x = 0; x < N; x++) {
    int r;
    int already_got;

    do {
	already_got = 0;
	r = random_number();
	for (z = 0; z < x; z++)
	    if (array[z] == r)
		already_got = 1;
    } while (already_got);

    array[x] = r;
}