Description
Focus
- Dynamic memory
Problem:
Building on previous assignments, we will be reading a file of commands to create Nobles and Warriors, and sending them off to battle.
Key differences:
- Each time a warrior or a noble is defined, we will create it on the heap.
- We will keep track of the nobles in a vector of pointers to nobles.
- We will keep track of all warriorsusing a vector of pointers to warriors.
The input file will be named “nobleWarriors.txt”.
Commands
- Create a Noble on the heap.
- Create a Warrior on the heap.
- Call the Noble’s hire method.
- Call the Noble’s fire method.
- Call the Noble’s battle method.
- The status command shows the nobles, together with their armies, as we did previously. In addition, it will show separately the warriors who do not currentle have a employer
- Clear out all the nobles and warriors that were created.
Our application is going to rely on each Noble having a unique name and each Warrior having a unique name. Otherwise, how would we be sure who we were hiring (or firing). Note that this is not a requirement of the Noble and Warrior classes themselves, just of this particular use of them, i.e. our application.
Whenever you are displaying a Noble or a Warrior, you will use the output operator for the class.
Handle errors!
Previously we promised that all of the commands we gave you the input would be valid. Now we would like you to take some responsibility for checking the input. First, we still guarantee that the format of the file will be correct. That means that the Warrior command will always have a name and a strength. The Battle command will always have two names. The Status command will not have any other information on it than just the word Status.
However, you will need to detect and report any issues indicating inconsistencies, such as:
- Noble command: if a Noble with a given name already exists.
- Warrior command:if a Warrior with a given name already exists.
- Hire command: If a Noble tries to hire a Warrior and either of them do not exist.
- Fire command: If a Noble tries to fire a Warrior and either the Noble does not exist or does not have the Warrior by that name in this army.
- Battle command: If a Noble initiates a battle with another Noble, but one or the other does not exist.
We have not specified the format of these error messages, so we’ll leave that up to you. (You get to be creative!)
Example input file (no errors):
Noble King_Arthur
Noble Lancelot_du_Lac
Noble Jim
Noble Linus_Torvalds
Noble Bill_Gates
Warrior Tarzan 10
Warrior Merlin 15
Warrior Conan 12
Warrior Spock 15
Warrior Xena 20
Warrior Hulk 8
Warrior Hercules 3
Hire Jim Spock
Hire Lancelot_du_Lac Conan
Hire King_Arthur Merlin
Hire Lancelot_du_Lac Hercules
Hire Linus_Torvalds Xena
Hire Bill_Gates Hulk
Hire King_Arthur Tarzan
Status
Fire King_Arthur Tarzan
Status
Battle King_Arthur Lancelot_du_Lac
Battle Jim Lancelot_du_Lac
Battle Linus_Torvalds Bill_Gates
Battle Bill_Gates Lancelot_du_Lac
Status
Clear
Status
Example output:
Status
======
Nobles:
King_Arthur has an army of 2
Merlin: 15
Tarzan: 10
Lancelot_du_Lac has an army of 2
Conan: 12
Hercules: 3
Jim has an army of 1
Spock: 15
Linus_Torvalds has an army of 1
Xena: 20
Bill_Gates has an army of 1
Hulk: 8
Unemployed Warriors:
NONE
You don’t work for me anymore Tarzan! — King_Arthur.
Status
======
Nobles:
King_Arthur has an army of 1
Merlin: 15
Lancelot_du_Lac has an army of 2
Conan: 12
Hercules: 3
Jim has an army of 1
Spock: 15
Linus_Torvalds has an army of 1
Xena: 20
Bill_Gates has an army of 1
Hulk: 8
Unemployed Warriors:
Tarzan: 10
King_Arthur battles Lancelot_du_Lac
Mutual Annihalation: King_Arthur and Lancelot_du_Lac die at each other’s hands
Jim battles Lancelot_du_Lac
He’s dead, Jim
Linus_Torvalds battles Bill_Gates
Linus_Torvalds defeats Bill_Gates
Bill_Gates battles Lancelot_du_Lac
Oh, NO! They’re both dead! Yuck!
Status
======
Nobles:
King_Arthur has an army of 1
Merlin: 0
Lancelot_du_Lac has an army of 2
Conan: 0
Hercules: 0
Jim has an army of 1
Spock: 15
Linus_Torvalds has an army of 1
Xena: 12
Bill_Gates has an army of 1
Hulk: 0
Unemployed Warriors:
Tarzan: 10
Status
======
