Bubbles often pop on their own and often they pop when they hit something. Either way they eventually burst. BTW, you've probably heard someone say something like, "Hate to burst your bubble, but...." That's a popular idiom which gets used in a variety of situations.

ASSIGNMENT:

Implement the following alterations to the sample program:

• Keep track of how many bubbles are popped.
• Keep track of how many bubbles make it to the top of the screen without being popped.
• Obviously, you should display these numbers so the user can see his or her bubble-popping success rate.
• Make it so that bubbles are not popped by the shaft of the arrow. (HINT: Divide the arrow into two sprites: the shaft and the arrow tip.)