CptS 122 – Data Structures
Programming Assignment 2: Video Playlist Manager &
Doubly Linked Lists
– Part I
Assigned: Friday, January 30, 2020
Due: Monday, February 10, 2020 by midnight
I. Learner Objectives:
At the conclusion of this programming assignment, participants should be able to:
o Design and implement a dynamic doubly linked list
o Allocate and de-allocate memory at runtime
o Manipulate links in a dynamic list
o Insert items into a dynamic linked list
o Delete items from a dynamic linked list
o Edit items in a dynamic linked list
o Traverse a dynamic linked list
Before starting this programming assignment, participants should be able to:
o Analyze a basic set of requirements for a problem
o Compose C language programs
o Create basic test cases for a program
o Apply arrays, strings, and pointers
o Summarize differences between array notation and pointer notation
o Apply pointer arithmetic
o Apply basic string handling library functions
o Define and implement structures in C
o Summarize the operations of a linked list
III. Overview & Requirements:
Many of us have utilized some type of video application (YouTube). It would be nice
to have a program that would manipulate your video collection based on attributes
such as Film Title, Running Time, Genre, Description, Year, Director. For this
assignment you will write a basic video playlist manager.
Your program must have a text-based interface which allows the user to select from
a main menu of options including: (1) load, (2) store, (3) display, (4) insert, (5)
delete, (6) edit, (7) sort, (8) rate, (9) play, (10) shuffle, and (11) exit. For Part I of
the assignment, you will only need to complete the main menu, (1) load, (2) store, (3)
display, (6) edit, (8) rate, (9) play, and (11) exit features. The other features will be
completed in the next part of the assignment.
o What must the main menu contain?
The main menu must display the following commands:
After a command is selected and completed, your program must display
the main menu again. This procedure will continue until the “exit” command is
o What must “load” do?
The “load” command must read all records from a file
called moviePlayList.csv attached to the assignment on blackboard into a
dynamic doubly linked list. The doubly linked list is considered the main playlist. As
each record is read from the file, it must be inserted at the front of the list.
Each record consists of the following attributes:
o Film Title – a string
o Director – a string
o Description – a string
o Genre – a string
o Running Time – a struct Duration type consisting of hours and minutes,
o Year – an integer
o Number times played – an integer
o Rating – an integer (1 – 5)
Each attribute, in a single record, will be separated by a comma in the .csv (comma
separated values) file. This means that you will need to design an algorithm to extract
the required attributes for each record. Each field in each record will have a value.
You do not need to check for null or empty values.
You must define a struct called Record to represent the above attributes. Also, do
not forget that the Movie Length must be represented by another struct
Duration is defined as follows:
o Hours – an integer
o Minutes – an integer
Finally, each struct Node in the doubly linked list must be defined as follows:
o Data – a Record
o Pointer to the next node
o Pointer to the previous node
o What must “store” do?
The “store” command writes the current records, in the dynamic doubly linked list,
to the moviePlayList.csv file. The store will completely overwrite the previous
contents in the file.
o What must “display” do?
The “display” command prints records to the screen. This command must support
three methods, one of which is selected by the user:
1. Print all movies.
2. Print all records that match a director.
3. Print all records that match a year.
o What must “edit” do?
The “edit” command must allow the user to find a record in the list by director. If
there are multiple records with the same director, then your program must prompt
the user which one to edit. The user may modify all of the attributes in the record.
o What must “rate” do?
The “rate” command must allow the user to assign a value of 1 – 5 to a movie; 1 is the
lowest rating and 5 is the highest rating. The rating will replace the previous rating.
o What must “play” do?
The “play” command must allow the user to select a movie and must start “playing”
each movie in order from the current movie. “Playing” the movie for this assignment
means displaying the contents of the record that represents the movie for a short
period of time, clearing the screen and showing the next record in the list, etc. This
continues until all movies have been played.
o What must “exit” do?
The “exit” command saves the most recent list to the moviePlayList.csv file.
This command will completely overwrite the previous contents in the file.
IV. Logical Block Diagram
The logical block diagram for your doubly linked list should look like the following:
As you can see from the illustration a doubly linked list has a pointer to the next node
and the previous node in the list. The first node’s previous node pointer is always
NULL and the last node’s next pointer is always NULL. When you insert and delete
nodes from a doubly linked list, you must always carefully link the previous and next
V. Submitting Assignments:
1. Must submit your assignment in a zip file through
2. Your project must contain at least one header file (a .h
file), two C source files (which must be .c files), and a local
copy of the .csv file.
3. Your project must build properly. The most points an
assignment can receive if it does not build properly is 65
out of 100.
VI. Grading Guidelines:
This assignment is worth 100 points. Your assignment will be evaluated based on a
successful compilation and adherence to the program requirements. We will grade
according to the following criteria:
o 5 pts – Appropriate top-down design, style, and commenting according to class
o 4 pts – For correct definition of struct Record.
o 2 pts – For correct definition of struct Duration.
o 3 pts – For correct definition of struct Node.
o 5 pts – For correctly displaying the main menu, getting the command from the
user, and executing the command.
o 3 pts – For looping back to main menu after a command is executed.
o 21 pts – For correctly constructing a doubly linked list, including:
o (6 pts) For correct implementation for allocating space for a struct Node on
the list, and initializing the node.
o (9 pts) For correct implementation of insertFront() function, which
allocates a new node and adds it to the front of the DLL. Returns 1 for
successfully allocating space for a node; 0 otherwise.
o (6 pts) For correct implementation of printList(), which visits each
node in the list and prints out the contents of the movie record.
o 15 pts – Correct “load” command implementation.
o (2 pts) For correctly opening moviePlayList.csv for mode “read”.
o (6 pts) For correctly extracting each attribute from each movie record in
o (5 pts) For correctly using insertFront().
o (2 pts) For correctly closing moviePlayList.csv.
o 13 pts – Correct “store” command implementation, which writes the records in the
list to the moviePlayList.csv file.
o (3 pts) For opening musicPlayList.csv for mode “write”.
o (10 pts) For correctly writing all the records in the list to the file,
maintaining the .csv format.
o 7 pts – For correct “display” command implementation.
o (2 pts) For displaying all records by using printList().
o (5 pts) For searching for specific records based on director or year and
displaying matching record – should be able to use the same search function
as used in the “edit” command.
o 7 pts – Correct “edit” command implementation.
o (2 pts) For searching for specific records based on director – should be able
to use the same search function as used in the “display” command.
o (5 pts) For editing the record specified by the user.
o 3 pts – Correct “rate” command implementation.
o 7 pts – Correct “play” command implementation.
o (2 pts) For playing all movie in order until the end of the list.
o (5 pts) For searching for specific movie based on movie title and playing all
movies until the end of the list has been reached.
o 5 pts – Correct “exit” command implementation, which writes the records in the
list to the moviePlayList.csv file and exits the program.