85 lines
5.8 KiB
Markdown
85 lines
5.8 KiB
Markdown
# Homework 1 — Spotify Playlists
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Before starting this homework, make sure you have read and understood the Academic Integrity Policy.
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In this assignment you will develop a program to manage music playlists like Spotify does, let's call this program New York Playlists. Please read the entire handout before starting to code the assignment.
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## Learning Objectives
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- Practice handling command line arguments
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- Practice handling file input and output
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- Practice the C++ Standard Template Library string and vector classes.
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## Background
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On Spotify, users can create and manage playlists. On the Spotify app or website, users can navigate to the "Your Library" section and click on the "+" sign to create a playlist. When creating a playlist, users can add music tracks to the playlist.
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After a playlist is created, users can add new tracks to this playlist, or remove tracks from this playlist. Users can also re-order tracks within a playlist. The following two images show the re-order process:
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Before re-ordering, track 1 is "Perfect Duet", track 2 is "Always Remember Us This Way", track 3 is "Million Reasons", and track 4 is "I'll Never Love Again".
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Next, we drag track 4 up to right above track 2.
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After this dragging action, now, track 1 is still "Perfect Duet", track 2 is "I'll Never Love Again", track 3 is "Always Remember Us This Way", and track 4 is "Million Reasons".
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## Command Line Arguments
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Your program will expect 4 command line arguments. The first is the name of the input file. The second is
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the name of the output file. The third argument is an integer that specifies the width of the text column. The
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fourth argument will be a string (flush_left, flush_right, or full_justify) specifying which formatting
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mode should be used. Here are examples of valid command lines for your program:
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```console
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./nyplaylists.exe playlist1.txt output.txt add
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./nyplaylists.exe playlist1.txt output.txt remove
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./nyplaylists.exe playlist1.txt output.txt reorder old new
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./nyplaylists.exe playlist1.txt output.txt skip count
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```
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You should implement very simple error checking to ensure that 4 arguments are provided and that the
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input and output file streams are successfully opened. You should also check that the values for the third
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and fourth arguments are valid. Your program should exit gracefully with a useful error message sent to
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std::cerr if there is a problem with the arguments.
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You must follow the specifications for the command line, input file, and output file exactly to ensure you
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receive full credit from the Submitty homework submission autograder. We have provided sample input &
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output files on the course website. Examples of using command line arguments can be found on the course
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webpage: [Programming Information](https://www.cs.rpi.edu/academics/courses/fall23/csci1200/programming_information.php).
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## File I/O
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You will read the words to format from an input text file. You should not make any assumptions about the
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formatting of this file, except that the words will be separated by at least one whitespace character. Remember
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that whitespace characters include spaces, tabs, and newlines. Any punctuation in the file (including periods,
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commas, apostrophes, etc.) should be treated as part of the word if it is not separated from the word by
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spaces. The basic iostream string input operator, >>, will work perfectly for this assignment. The output of
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your program will be written to a file, and should follow the specifications in this handout and match our
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examples. Reading and writing files in C++ is very similar to std::cin and std::cout. See examples of
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STL file streams on the course webpage [Programming Information](https://www.cs.rpi.edu/academics/courses/fall23/csci1200/programming_information.php).
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## Corner Cases
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So now you understand the core requirements for this assignment, but you may already have thought of a
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few problem cases. For example, how should the program full justify a line that contains just a single word?
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There are no available slots between words to use to insert the extra spaces. In this case your program
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should simply left justify the line. Another question you might ask is what to do if one of the words in the
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file is (by itself!) wider than the width of the column? In your initial coding and testing we recommend you
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assume that this will never happen. This solution will be worth nearly full credit. To receive full credit on
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the assignment your program should handle this case by splitting the word and inserting a hyphen. Note
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that we do not expect you to properly split the words between syllables, as that would require a database
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of English words and syllables. If you think of other corner cases as you work on the assignment, propose
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reasonable ways to handle those situations. If those solutions are overly complex or tricky, you do not need
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to tackle the implementation, but you should write up your thoughts in your README.txt for the grader
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to read.
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## Submission Details
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Use good coding style when you design and implement your program. Organize your program into functions:
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don’t put all the code in main! Be sure to read the [Homework Policies](https://www.cs.rpi.edu/academics/courses/fall23/csci1200/homework_policies.php) as you put the finishing touches on your solution. Be sure to make up new test cases to fully debug your program and don’t forget
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to comment your code! Use the provided template [README.txt](./README.txt) file for notes you want the grader to read.
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You must do this assignment on your own, as described in the [Collaboration Policy & Academic Integrity](https://www.cs.rpi.edu/academics/courses/fall23/csci1200/academic_integrity.php) page. If you did discuss the problem or error messages, etc. with anyone, please list their names in your
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README.txt file. Prepare and submit your assignment as instructed on the course webpage. Please ask a TA
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if you need help preparing your assignment for submission.
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**Due Date**: 09/07/2023, 23:59pm.
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