Description
Goals
Identify requirements for a program using polymorphism
Create a program to demonstrate your class hierarchy
You will create a simple class hierarchy as the basis for a fantasy combat game. Your ‘universe’ contains the
creatures in the table. Each will have characteristics for attack, defense, armor, and strength points.
Type Attack Defense Armor Strength Points
Medusa4 2d6 *Glare 1d6 3 8
Barbarian2 2d6 2d6 0 12
Baba Yaga1 2d6 *Soul 1d10 3 12
Blue Men3 2d10 3d6* 3 12 *Mob
Harry Potter5 2d6 2d6 0 10/20*Hogwarts
3d6 is rolling three 6-sided dice. 2d10 is rolling two 10-sided dice.
*Glare- If a Medusa rolls a 12 in attack then the target has looked her in the eyes and is turned to stone. The
Medusa wins!
*Soul- Baba Yaga feeds on the pain and suffering of others. When she makes a successful attack her attack
roll is applied to her opponent, but she gains points equal to the points lost by her opponent. For example,
she makes an attack and 3 points of damage are inflicted. She increases her strength points by 3 also. When
she attacks she receives 1/3rd of the damage points inflicted by her attack, rounded down. Her total can
exceed 12. She wears no physical armor but has many spells and enchantments to protect her.
*Mob- The Blue Men are actually a swarm of small individuals. For every 4 points of damage (round
down) they lose one defense die. For example, when they reach strength of 8 they only have 2d6 for
defense.
*Hogwarts- If Harry dies (i.e. strength >=0) he immediately recovers. His total strength becomes 20. If he
were to die again then he’s dead.
HINT: None of these abilities requires their own function! None of them change the data going in or out of
the attack and defend functions. For example consider the Medusa Glare. How can you modify the result of
the attack function to guarantee ANY opponent loses the fight?
To resolve an attack you will generate 2 dice rolls. The attacker rolls the appropriate number and type of dice
under Attack. The defender rolls the appropriate number and type of dice under Defense. You subtract the
Defense roll from the Attack roll. Then subtract the armor, if any. That is the damage. Example function
prototypes: int attack() void defend(int)
Each class only has its own information or data. When O1 is fighting O2 your program should call O1’s
attack function. It will return the damage inflicted. Then O2’s defense function will take the damage
inflicted, then roll the specified dice and subtract the points for the defense. To apply the damage you
subtract the Armor value. The result is then subtracted from the Strength Points. That value becomes the
new Strength Points for the next round. If Strength Points goes to 0 or less then the character is out of the
combat. If it receives 8 points of damage and rolls 3 for it’s defense and has an armor of 3 it would take 8
subtract 3 and then 3 for the armor to receive 2 points of damage.
You need to create a Creature class. Then you will have a subclass for each of these characters. Note that the
Creature class will be an abstract class. You will never instantiate one. Since each starts with the same data
elements you will only need one constructor. Each Creature will have an attack and defend function. Since
they differ they will be pure virtual functions in the Creature base class. Each class will be in a separate
source file with its own header file.
This is the first stage in what will be a larger project. Please do not add any creatures of your own.
You must complete your design document. In that document and in your reflections you can discuss how the
original design may have changed as you worked through the problems. You must also submit a test plan.
The test plan should cover all logic paths. So you should have each character type have combat with all
character types (including another of its own). Remember to submit these documents as PDF files.
It is not hard, just a lot to think about. The TAs will be asked to grade your project against your design so
please do not just throw together some random stuff so you have a file to submit. No, you are not required to
implement only the design you submit. BUT, your reflections will need to explain the difference. So the old
adage garbage in, garbage out will not apply here. If you give us a random design you will need to explain
each step in how you got to the code submitted. In other words, that will make it much more difficult. So,
learn a good habit and think about it before you start coding. J
HINT: This program has a random element. You will need to address that in your test plan. It will also
affect debugging. Your design should address this (potential) problem. It is not hard but you need to think
about it.
What you need to submit:
Your program file(s) with the implementation of these five creatures inheriting from a single parent.
Your design document (including the class hierarchy)
Your test plan
Your reflections document- including the design and test documentation
1. Slavic (Russian) witch.
2. Think Conan or Hercules from the movies. Big sword, big muscles, bare torso.
3. They are small (6” tall), fast and tough. So they are hard to hit and can take some damage. As for the
attack value, you can do a LOT of damage when you can crawl inside the armor or clothing of your opponent.
J And yes they are the Nac Mac Feegle of Discworld. I just wanted a shorter name for your project.
4. Scrawny lady with snakes for hair. They help with fighting. Just don’t look at her!
5. Why are you reading this? How can you not know who Harry Potter is? J
NOTE: The sample creatures are unbalanced intentionally. This will help you in debugging your
program! Some will win a lot, and others will lose a lot.
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Grading:
• programming style and documentation (10%)
• In each of these the virtual attack and defense functions must work correctlyo create the base class and the Barbarian class (15%)
o create the Medusa class- overload or redefine attack function (10%)
o create the Bab yaga class (10%)
o create the Blue Men class (10%)
o create the Harry Potter class- overload or redefine defense function (10%)
• create a test driver program to create character objects which make attack and defense rollsrequired to show your classes work correctly (15%)
• reflections document to include the design description, test plan, test results, and comments
about how you resolved problems during the assignment (20%)
Suggestion: The grading is set up to encourage you to develop your program incrementally! Start with the
base and Barbarian classes. The Barbarian has no special attack or defend abilities. Create the testing
program that runs sample combats for you toe test your code. How do you handle random die rolls when
testing your code? Then do the others.
Hint: Create your design before coding anything! You should even be outlining your test plan. At each step
of the process make notes about what worked, what changed. Doing this as you progress will make writing
the reflections easier.
