Implementation Specifications:

Detailed behavior of about each menu option is mentioned below with screenshots.

Register User

Request a user to provide a name for registration within the application. It is assumed that only the first name is required. The application is required to keep track of all the registered users in a text file named "user$\_$data.txt$"$ and should verify whether a user with the entered name already exists. The search for existing users should be case$-$insensitive, meaning that variations in capitalization $($e$.$g$.,$ Sam, SAM, SaM, sam$)$ should all be considered equivalent. If a user with the specified name is found in the database, application should output "User already exists. Please choose a different name." This process should continue until the user inputs a name that is not present in the database. Upon a successful registration, the application should display the message "User is successfully registered" followed by the main menu $($refer to Fig. $2).$

Register User

Display Movies

Rate a Movie

Get Movie Recommendations

Exit

Enter your choice: $1$

Enter username for registration: kay

User already exists. Please choose a different name.

Enter username for registration: sam

User already exists. Please choose a different name.

Enter username for registration: tom

User tom is successfully registered.

Figure $2.$ Register a user

Display Movies

List of all the available movies in the database, which is stored in a text file name "movie$\_$database.txt$",$ is displayed in an indexed manner.

Rate a Movie

Request the user to input a username. If the provided username is not found in the user database, the application should display the message "User not found. Please register first." Subsequently, the main menu must be presented again. In the event that the entered username exists, the application should exhibit a list of all movies from the database.

Next, the user is prompted to input a movie index number to provide a rating. It is assumed that the user will enter a number; nonetheless, the program must validate