Question

Well my project requires me for make a link list within a link list. Is it ok for me to define it this way?

struct users {
  int user_ID;

  struct playlist{
    int album;
    int track_num;
    struct playlist *next;
  }

  struct users *next;
};

Answer 1

Why not separate the structures?

struct Playlist{
    int album;
    int track_num;
    struct Playlist *next;
}


struct users {
  int user_ID;

  struct Playlist playlist 
  struct users *next;
};

it makes it easier to read, and easier to comprehend.