Anitraresults.md

java/src/main/java/Bins.java

@@ -1,4 +1,34 @@
 
 public class Bins {
+    private int[] bins;
+    private int min; // minimum sum
+    private int max; // maximum sum
 
+    public Bins(int min, int max) {
+        this.min = min;
+        this.max = max;
+        this.bins = new int[max - min + 1]; // array index = sum - min
+    }
+
+    public void incrementBin(int sum) {
+        if (sum < min || sum > max) {
+            throw new IllegalArgumentException("Sum out of range");
+        }
+        bins[sum - min]++;
+    }
+
+    public int getBin(int sum) {
+        if (sum < min || sum > max) {
+            throw new IllegalArgumentException("Sum out of range");
+        }
+        return bins[sum - min];
+    }
+
+    public int getTotalRolls() {
+        int total = 0;
+        for (int count : bins) {
+            total += count;
+        }
+        return total;
+    }
 }

java/src/main/java/Dice.java

@@ -1,4 +1,22 @@
+import java.util.Random;
+
 public class Dice {
+    private int numberOfDice;
+    private int sides;
+    private Random random;
 
+    public Dice(int numberOfDice, int sides) {
+        this.numberOfDice = numberOfDice;
+        this.sides = sides;
+        this.random = new Random();
+    }
 
+    public int roll() {
+        int total = 0;
+        for (int i = 0; i < numberOfDice; i++) {
+            total += random.nextInt(sides) + 1; // 1 to sides
+        }
+        return total;
+    }
 }
+

java/src/main/java/Simulation.java

@@ -1,5 +1,59 @@
 public class Simulation {
+    private Dice dice;
+    private Bins results;
+    private int numberOfTosses;
 
+    public Simulation(int numberOfDice, int numberOfTosses) {
+        this.dice = new Dice(numberOfDice, 6);
+        this.results = new Bins(numberOfDice, numberOfDice * 6);
+        this.numberOfTosses = numberOfTosses;
+    }
 
+    public void runSimulation() {
+        for (int i = 0; i < numberOfTosses; i++) {
+            int roll = dice.roll();
+            results.incrementBin(roll);
+        }
+    }
 
+    public void printResults() {
+    int total = results.getTotalRolls();
+
+    System.out.println("***");
+    System.out.println("Simulation of 2 dice tossed for " + total + " times.");
+    System.out.println("***\n");
+
+    // Find max count for scaling
+    int maxCount = 0;
+    for (int sum = 2; sum <= 12; sum++) {
+        int count = results.getBin(sum);
+        if (count > maxCount) {
+            maxCount = count;
+        }
+    }
+
+    int maxStars = 50; // width of histogram
+
+    for (int sum = 2; sum <= 12; sum++) {
+        int count = results.getBin(sum);
+        double percentage = (double) count / total;
+
+        // Scale stars relative to max
+        int starCount = (int) (((double) count / maxCount) * maxStars);
+
+        StringBuilder stars = new StringBuilder();
+        for (int i = 0; i < starCount; i++) {
+            stars.append("*");
+        }
+
+        System.out.printf("%2d : %8d: %.2f %s%n",
+                sum, count, percentage, stars.toString());
+    }
 }
+
+    public static void main(String[] args) {
+        Simulation sim = new Simulation(2, 1000000);
+        sim.runSimulation();
+        sim.printResults();
+    }
+}

java/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst

@@ -0,0 +1,3 @@
+/Users/anitra/Projects/DiceyLab/java/src/main/java/Dice.java
+/Users/anitra/Projects/DiceyLab/java/src/main/java/Simulation.java
+/Users/anitra/Projects/DiceyLab/java/src/main/java/Bins.java