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UW CSE 142 - Homework Assignment

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1 of 2 CSE 142, Autumn 2011 Programming Assignment #1: Song (10 points) Due Wednesday, October 5, 2011, 11:30 PM Program Description: This program tests your understanding of static methods and println statements. Write a Java class called Song in a file named Song.java. (Use exactly this file name, including identical capitalization.) A cumulative song is one where each verse builds upon previous verses. Examples of cumulative songs are "The House That Jack Built" and "There Was An Old Lady Who Swallowed A Fly." For this assignment, you will write a program that outputs the following cumulative song, written by the instructors: The first five verses printed by your program must exactly reproduce the output at left. This includes identical wording, spelling, spacing, punctuation, and capitalization. However, to encourage creativity, the last verse of your song (the final bold part in << >> ) may print any text you like. Creative verses submitted may be shown in class anon-ymously at a later date. The only restrictions on your custom verse are the following: • The verse must not be identical to an-other verse or consist entirely of text from earlier in the song. • The number of total lines in the verse should be at least 3 but no more than 50. • The text of the verse should not include hateful, offensive, or otherwise inappro-priate speech. • The code to produce the verse is still subject to the style guidelines on the next page. One way to write this program would be to simply write a series of println statements that output each line of the song in order. But such a solution would not receive full credit. Part of the challenge of this assignment lies in recognizing the structure and redundancy of the song and improving the code using static methods. (continued on back) I once wrote a program that wouldn't compile I don't know why it wouldn't compile, My TA just smiled. My program did nothing So I started typing. I added System.out.println("I <3 coding"), I don't know why it wouldn't compile, My TA just smiled. "Parse error," cried the compiler Luckily I'm such a code baller. I added a backslash to escape the quotes, I added System.out.println("I <3 coding"), I don't know why it wouldn't compile, My TA just smiled. Now the compiler wanted an identifier And I thought the situation was getting dire. I added a main method with its String[] args, I added a backslash to escape the quotes, I added System.out.println("I <3 coding"), I don't know why it wouldn't compile, My TA just smiled. Java complained it expected an enum Boy, these computers really are dumb! I added a public class and called it Scum, I added a main method with its String[] args, I added a backslash to escape the quotes, I added System.out.println("I <3 coding"), I don't know why it wouldn't compile, My TA just smiled. << your custom 6th verse goes here >>2 of 2 Style Guidelines: You should not place any println statements in your main method. (It is okay for main to have empty println statements to print blank lines.) Instead of printing in main, use static methods for two reasons: 1. Structure You should write static methods to capture the structure of the song. You should, for example, have a method for each of the verses of the song (including your custom verse) to print that verse's entire contents. 2. Eliminating redundancy You should use only one println statement for each distinct line of the song (other than blank lines). For ex-ample, the following line appears several times in the output, but you should have only one println statement in your program that prints that line of the song: All my TA gave me was a smile. A method that prints just one line is not good style. Instead, identify groups of lines that appear in multiple places in the song and create methods to represent those groups. There is a general cumulative structural re-dundancy to the song that you should eliminate with your methods. Recall that methods can call other methods if necessary (which can themselves call other methods, and so on). The key question to ask is whether you have repeated lines or groups of lines of code that could be eliminated if you structured your methods differently. This includes sequences of println statements and also repeated sequences of method calls. You do not have to eliminate partial-line redundancy in lines that are similar but not identical, such as the lines that start with “I added a.” Include a comment at the beginning of your program with some basic information and a description of the pro-gram in your own words. For example: // Suzy Student, CSE 142, Autumn 2049, Section XX // Programming Assignment #1, 06/07/49 // // This program's behavior is ... For this assignment, you should limit yourself to the Java features covered in Chapter 1 of the textbook. Though we will cover Chapter 2 while you work on this assignment, please do not use Chapter 2 features on this program, such as mathematical expressions, print statements (as opposed to println), or for loops. As a point of reference, our solution to this program has 12 methods other than main and is around 80 lines long including comments and blank lines. This is just a rough guideline; you do not have to match this exactly. Submission and Grading: Turn in your Java source code file electronically from the Homework link on the course web site. Part of your program's score will come from its "external correctness." External correctness measures whether the output matches exactly what is expected. (We are very picky about the output matching exactly. Every character and space must match.) Programs that do not compile will receive no external correctness points. The rest of your program's score will come from its "internal correctness." Internal correctness measures whether your source code follows the stylistic guidelines specified in this document. This includes having an adequate comment header and capturing the structure and redundancy of the song as specified previously. You should also limit the lengths of all lines in your program to fewer than 100


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