meillo@2: 
meillo@3: unsigned char action(struct Node* node);
meillo@2: 
meillo@3: unsigned char action_print(struct Node* node);
meillo@3: unsigned char action_sum(struct Node* node);
meillo@3: unsigned char action_number(struct Node* node);
meillo@3: unsigned char action_input(struct Node* node);
meillo@5: unsigned char action_times(struct Node* node);
meillo@5: unsigned char action_blackhole(struct Node* node);
meillo@2: