Compsci 100e, Spring 2011, In-Class Exercise 2

Names and NetID of students in group (min 2, max 3)

Name: __________________________   NetID: _____________

Name: __________________________   NetID: _____________

Name: __________________________   NetID: _____________

Calculating the Mode

This classwork focuses on implementing computing the mode of a list of numbers. The mode is the most commonly occuring value(s) in a data set.

The ClassScores class includes a method called getScanner. This method opens up a file chooser and returns a Scanner to the selected file. Write the necessary code in your main method to construct a ClassScores object and call the getScanner method to bind the selected file to a Scanner named in.
When working with files, you often need to read in the data and check that it matches your expectations. Complete the method readAndPrintFile, to print each token from the file - one per line.
For example, if given the following file excerpt of library holdings from the data directory:

your program should print:
The mode of a list of numbers is the most commonly occuring number(s). For example, if you have the following numbers, [88, 70, 65, 70, 88], the modes are 70 and 88 because they occur twice, while 65 ocurs once. The following problems ask you to complete methods in the ClassScores class that you snarfed.
1. The ClassScores class has two different findMode methods. Why? How does Java distinguish the two methods? Write your answer in your README.
2. Complete the findMode(int[]) method. Test using:
  1. the array example in the main method
  2. the APT page.
3. Complete the findMode(Scanner) method. You should be able to ignore everything other than numbers by using Scanner's hasNextInt() method. Test your code using:
  - Files in the data directory.
  - Files that you create

Submitting

You will submit your code as part of the next set of APTs.

If you need to check in your project so you can work on it with another machine, follow the Ambient Check-in and Checkout instructions.