CS 50 Homework 10 (Section 1 — Prof. Marshall)

If you wish, you may work with one other person on this assignment. If you work with a partner, turn in only one copy of your code, but include both of your names in a comment at the top of each file.

1. Letter Frequencies. Finish Problem 3 from Lab 11. You can find a copy of the lab handout in the CS 50 class folder under Labs/Lab11 (or click here). Files to submit: LetterFreqs.java

2. The Game of Life. Programming Exercise P11.17 (page 476), with the following modifications:
   • Have the program ask the user for the name of a text file containing a rectangular grid of x's and periods (.) representing an initial grid pattern (where x means on and . means off). The program should read in the file and initialize the grid according to the pattern. An example pattern is shown below:

     ...........................
     ...........................
     ...........................
     ...........................
     ...........x...............
     .............x.............
     ..........xx..xxx..........
     ...........................
     ...........................
     ...........................
     ...........................
     

   • The LifePatterns subfolder in the CS 50 class folder contains several interesting pattern files that you can use for testing purposes.

   • You are not allowed to use the ConsoleReader class for this problem. To read user input from the keyboard, you should use either the FileReader/BufferedReader classes or the JOptionPane class (described on pages 163-164 of your textbook).

   • Name your applet program and HTML file "Life". Files to submit: Life.java, Life.html

EXTRA CREDIT PROBLEM

1. The Vigenère Cipher. Programming Exercise P13.4 (page 558). Files to submit: Cipher.java

Turning in Your Homework

To turn in your homework, put the specified files into a single folder named Your Name HW 10 and drop this folder into the drop box. If you work with a partner, put both of your names on the folder. If you are an off-campus student, you may copy your folder to a CLEAN floppy disk (one containing no other files or folders), and hand this in at the beginning of class, instead of using the drop box.