CompSci 4 - Classwork - Nov 1, 2005
5 pts
Today's classwork goes along with Chapter 7, Section 2.
You will be using random variables and writing a while loop.
In today's world, you will be writing a loop to randomly move
Cinderella and the handsome prince repeatedly until they finally
meet and touch hands!
For the setup, they start touching hands and are in the "middle".
There are actually hidden tennisballs at this position, one for each of
them
so you can tell when they are in the "middle".
Both turn and move 10
units and turn back around. They are now 20 units from each other.
You will write code to move them both randomly forward 1, 2 or 3
units. Each can move up to 10 units forward.
- If they both reach the middle
at the same time, then the game is over and Cinderella should say "We are
connected!. They should stop moving.
- If one of them reaches the middle and the other one is not there. That
one
turns around and starts over.
Start by downloading the world willTheyMeet.a2w.
Play this world.
You will write one function and one method. All the others have been
written for you and do not need any modification.
- Write the function findRandInt. This function should return 1, 2 or
3,
indicating how far a person should move. However, the person must not go
past the middle!
(You might want to consider modifying the function randomInt by
adding a parameter to this
function so that given the parameter, you can return 1, 2, ... up to
the value of the parameter.)
- Write the method play. This method assumes the players are in the
starting positions. It repeatedly moves each player forward 1 to 3 units
at the same time, but not past the middle. If one reaches the middle and
the
other is not there, that one must start over. If they both reach the
middle,
then display a message and stop.
If you finish early, feel free to embelish your animations.