Introduction to Double Circular Linked List
Create a music player application to implement the double circular linked list data structure

##library integration

1. on Code::Blocks, go into menu project->Build Option
2. go to Linker Settings tab
3. click Add to add new lib function
4. type winmm
5. click OK

##list.h modify the elemenList and List structure to implement Double Circular linked list

##list.cpp modify each function to fit the data structure

• createList
• alokasi
• insertFirst, insertLast, insertAfter
• deleteFirst, deleteLast, deleteAfter to implement Double Circular Linked List mechanism

##player.cpp create function according to the header defined in player.h

• function to play the previous song on the list
  void playPrev(address &P);
• function to shuffle the song list
  void shuffleList(List &);
• function to sort the song list by some condition
  void sortList(List &, int condition); // example: if condition = 1, then sort by ID
// if condition = 2, then sort by name
  
• function to play the song list from the first song and repeat the list n times
  void playRepeat(List &, int n);

##main.cpp modify the main prorgam, add these menus into the main program

• menu to search song by name and play it
  ( you can create a new function to search or modify the findElm function )
• menu play the previous song on the list
• menu play again this song (the last played song)
• menu shuffle the song list
• menu sort the song list
• menu play repeat all songs