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Learning Profile for Assignment #2, And Question #4
Name: Mo Khan
Student ID: 3431709
1. Problem Statement:
Craps is a dice game where two dice are rolled.
Each die has six faces representing values:
1, 2, 3, 4, 5, or 6.
1. If the sum is 2, 3, or 12 (called craps), you lose;
1. If the sum is 7 or 11 (called natural), you win;
1. If the sum is any other value (4, 5, 6, 8, 9, or 10), a value point is established, and you continue to roll until you either roll a sum of the value point or a 7.
If the sum of the new roll is equal to the value point, then you win; if the sum of the new roll is equal to 7, then you lose.
Remember, in option (III), you continue to roll until you get a 7 or the value point.
Sample runs:
* You rolled 5 + 6 = 11; you win
* You rolled 1 + 2 = 3; you lose
* You rolled 2 + 2 = 4; you establish the value point 4;
– Roll again 2 + 3 = 5; roll
– Roll again 2 + 1 = 3; roll
– Roll again 2 + 2 = 4; you win
* You rolled 2 + 6 = 8; you establish the value point 8;
– Roll again 4 + 4 = 8; you win
* You rolled 3 + 2 = 5; you establish the value point 5;
– Roll again 1 + 1 = 2; roll
– Roll again 2 + 2 = 4; roll
* Roll again 1 + 1 = 2; roll
* Roll again 3 + 4 = 7; you lose
Develop a program that plays craps with a player three times.
At the end, the program prints the number of times the player won and the number of times the player lost.
1. Description of the Code:
I solved this problem by creating a class called `RandomSumGame` as per
the class diagram. I added two instance variables named `wins` and
`losses` to keep track of how many times the player won or lost.
To try to make the API of this class more testable, I chose to pass the
`PrintStream` in as a parameter to the constructor. This example of
dependency injection, made it possible to write unit tests to ensure the
proper output is printed to the stream.
To simplify the problem, I split it up into two types of game play. The
rules for the initial roll is slightly different for the rules for
subsequent rolls. I created two methods named `firstPlay` and `subsequentPlay`.
This made it easy to focus on the rules for the initial roll in the
`firstPlay` method and the rules for the subsequent roles in the
`subsequentPlay` method.
To roll the dice, I extracted a method called `roll` that returns a
random number between 1 - 6.
To keep track of the wins/losses, I delegating to the `win` or `lose`
methods to print a message to the screen and increment a win/loss
counter.
In the `main` method, I added a header for the game, then created an
instace of the game, ran 3 rounds of the game and printed the final
results afterwards.
There were some unneccessary instance variables, but I kept them to
ensure that I satisfy the desired API described in the class diagram.
In a few cases, local variables and recursion was more than enough.
I used `recursion` to handle subsequent rolls when a value point is
established. With any recursion it's important to have a solid base
case. In this case the base case was either rolling a 7 or the value
point. These values are randomly generated, so it is possible to produce
an infinte loop due to randomness.
1. Errors and Warnings:
1. Sample Input and Output:
1. 3 losses
```bash
Welcome to Craps
================
Game 1
You rolled: 5
Value point established: 5
You rolled: 7
You lose.
Game 2
You rolled: 6
Value point established: 6
You rolled: 5
You rolled: 9
You rolled: 7
You lose.
Game 3
You rolled: 3
Craps! You lose.
================
Wins: 0
Losses: 3
```
1. 3 wins
```bash
java -cp target/assignment2*.jar ca.mokhan.comp268.App 4
Welcome to Craps
================
Game 1
You rolled: 7
Natural! You win!
Game 2
You rolled: 7
Natural! You win!
Game 3
You rolled: 5
Value point established: 5
You rolled: 6
You rolled: 4
You rolled: 8
You rolled: 5
You win!
================
Wins: 3
Losses: 0
```
1. 2 wins, 1 loss
```bash
Welcome to Craps
================
Game 1
You rolled: 4
Value point established: 4
You rolled: 3
You rolled: 9
You rolled: 7
You lose.
Game 2
You rolled: 8
Value point established: 8
You rolled: 8
You win!
Game 3
You rolled: 8
Value point established: 8
You rolled: 2
You rolled: 8
You win!
================
Wins: 2
Losses: 1
```
1. Discussion:
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