For this assignment you will continue working with the "robot world" program from chapter 7 of the text.

Make the following modifications:

• Change the program so that the terrain the robot is entering determines how much energy the robot uses up (Problem 7.5.2 from the text).
• Change the program so that some of the terrain is impassible (the robot can't enter it), some is deadly (a robot entering it is immediately deleted), and some terrain cells are vortexes (a robot entering that cell automatically faces in a new random direction) (Problem 7.5.3 from the text).
• Change the program so that robots intereact. Currently when one robot tries to move into another robot's cell the move simply fails. Change the program so that either the robot in the destination cell is destryoed (deleted) or the robot in the destination cell gives some of its energy to the moving robot (which still doesn't move). Make sure to specify which verions you're doing in the block comment at the beginning of the program. (Problem 7.5.8 from the text).

Turn in: To turn the program you will need to combine all three of your files into one file that you can use cscheckin to submit (see assignment 8). On a Unix computer you do this by taring the files together. Use the command:
tar -cvf lab11.tar lab11.cpp robot.h world.h
(note your main program may have a name other than lab11.cpp, use that file name instead of lab11.cpp). This will combine the files into one file called lab11.tar. Use cscheckin to turn in that file.