struct number { char* label; struct number* next; } five = { "5", NULL }, four = { "4", &five }, three = { "3", &four }, two = { "2", &three }, one = { "1", &two }, zero = { "0", &one }; struct number* succ(struct number* num) { return num->next; } struct number* pred(struct number* num) { struct number* ret = &zero; while (succ(ret) != num) ret = succ(ret); return ret; } struct number* add_numbers(struct number* num_a, struct number* num_b) { if (num_b == &zero) return num_a; return succ(add...
