Exercises  (DLP for Virtual Environments (II))


1.Improve the example of ball kicking so that the soccer ball can continuously
 move to a new position. It would not just simply jump to the new position.

2. Design a DLP program to control the bus moving so that it can move along
 a route (which is defined by a set of facts, thus, a database).

*3.Improve the example of bus driving so that the user can start and stop
 the bus engine. Namely, the bus moves only after the engine starts, and
 the bus would not move if the engine stops.