Introduction

The objective of this mini-lab is to practice debugging code, and to experiment with the JES Watch feature.

Debugging

1. The following function is supposed to return an image of a flag. Read over the comments, as well as the code. Write down any errors that you find. Distinguish between syntax errors and logic errors.

   
   #Draw the flag of Kazooistan.  
   #  The flag is square with three colored regions: 
   #  the upper left quadrant is black, the upper right quadrant is orange
   #  and the bottom half is white.  
   #Parameter: size -- the width and height of the flag.
   #Returns: an image of the flag.
   
   def flag(size):
       pic = makeEmptyPicture(size, size, white)
       for x in range(1,size+1):
         for y in rage(1, size + 1):
           pix = getPixel(pic, y, x)
           # make the upper left black
           if y < (.5 * size) and x < (.5 * size)
             setColor(pix, black)
           # make the upper right orange
           if y < (.5 * size) and y < (.5 * size):
             setColor(pix, orange)
       return pic
   
   

2. Once you think you have found all of the errors in the above code, copy it into JES and try to run it. Fix the syntax errors at this point so that the code will actually load and run. You'll find that the code doesn't do quite what it should. If you didn't see the logic errors before, look over the code again to see if you can figure out now why the code isn't working correctly.
3. Before you try to fix the code, start the JES watcher and select the variables x and y to be watched. Step through the code several times to see if you have correctly diagnosed the errors.
4. Fix the code so that the flag is generated correctly.

Print your results

1. Show your results to your instructor when you are finished.
2. Print the corrected function and hand it in.