Lab 9: switch

Due Friday, September 29 at 11:59 PM

Goals for This Lab

By the time you have completed this work, you should be able to:

Provided files:

Step-by-Step Instructions

Step 1: Edit Weekdays.java

Download the Weekdays.java file, and open it in jGrasp (or a text editor of your choice). The program will ask for an integer between 0 and 4, inclusive. It will then print out which weekday corresponds to the input integer, or else the message “Invalid day: DAY”, where “DAY” represents the integer they input. Integers are mapped to weekdays in the following manner:

Weekday Integer ID
Monday 0
Tuesday 1
Wednesday 2
Thursday 3
Friday 4

Example output of the program is shown below, with user input shown in bold: 

Enter day (0-4): 3
Thursday

Further example output of the program is shown below, with user input shown in bold: 

Enter day (0-4): 5
Invalid day: 5

Step 2: Edit WeekdaysOnAndAfter.java

Download the WeekdaysOnAndAfter.java file, and open it in jGrasp (or a text editor of your choice). This program works similarly to the one you wrote in the previous step, except that it also prints the days that come after the given day. Example output of the program is shown below, with user input shown in bold: 

Enter day (0-4): 0
Monday
Tuesday
Wednesday
Thursday
Friday

Further example output of the program is shown below, with user input shown in bold: 

Enter day (0-4): 3
Thursday
Friday

Further example output of the program is shown below, with user input shown in bold: 

Enter day (0-4): 4
Friday

Further example output of the program is shown below, with user input shown in bold: 

Enter day (0-4): -1
Invalid day: -1

Step 3: Edit Compass.java

Download the Compass.java file, and open it in jGrasp (or a text editor of your choice). This program will randomly print out a compass direction, given a seed value for produce a random number with java.util.Random. Compass directions are mapped to integers according to the following table:

Compass Direction Integer ID
North 0
Northeast 1
East 2
Southeast 3
South 4
Southwest 5
West 6
Northwest 7

In order to accomplish this, you will need to write two methods, namely numberToDirection and randomDirection. Note that randomDirection MUST call numberToDirection! Additionally, you must use switch. Further details are in the comments of Compass.java.

Step 4: Open CompassTest.java as a Test File, and Edit It

Download the CompassTest.java file, being sure to put it in the same folder/directory as your Compass.java file. This file contains tests for the numberToDirection and randomDirection methods you wrote in the previous step. Open this file in jGrasp as a test file, using the same instructions you've used in previous labs. You need to write a number of tests in this file, and all of them must pass. The comments in the file provide more details.

Step 5: Turn in Your Solution Using Canvas

Log into Canvas, and go to the COMP 110L class. Click “Assignments” on the left pane, then click “Lab 9”. From here, you can upload your answers and your code. Specifically, you must turn in the following four files:

In addition, if you collaborated with anyone else, be sure to download collaborators.txt and write the names of the people you collaborated with in the file, one per line. Please submit this file along with the other four files.

You can turn in the assignment multiple times, but only the last version you submitted will be graded.