First Summer 2006

I am sure we will need to refer to them now and then.

The first world, referring to a problem on page 149, is here.

In this world:

• we use a built-in method to orient the ball

The second world, is here. In this world:

• we develop an own method,
• which uses an own function

The third world is here. In this world:

• we give an example of using an if statement in a function
• (we note that in this example the use of if is a bit redundant)
• and we use a couple more if statements in implementing the action to be taken
• (that is, to avoid collision the aircraft above should move up, the other down, but which is which?)

The third world is here.

It is based on a world worked out in chapter 5.

There are:

• expressions with multiple conditions,
• nested if statements,
• and some special effects (video and audio)

in this world.

The last world is here.

It mostly implements a simple, random motion.