init

c3/QuizTree.java

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+import java.util.*;
+import java.io.*;
+
+public class QuizTree {
+
+    private QuizTreeNode head;
+
+    // PROVIDED
+    // Returns the given percent rounded to two decimal places.
+    private double roundTwoPlaces(double percent) {
+        return (double) Math.round(percent * 100) / 100;
+    }
+
+    public int size() {
+        return size(head);
+    }
+
+    private int size(QuizTreeNode root) {
+        if (root == null) {
+            return 0;
+        }
+        return 1 + size(root.left) + size(root.right);
+    }
+
+    public QuizTree(Scanner inputFile) {
+        this.head = null; 
+        this.head = populateTree(inputFile, head);
+    }
+
+    private void printTree(QuizTreeNode root) {
+        if (root != null) {
+            System.out.println(root.data);
+            printTree(root.left);
+            printTree(root.right);
+        }
+    }
+        
+    private QuizTreeNode populateTree(Scanner inputFile, QuizTreeNode root) {
+        if (inputFile.hasNextLine()) {
+            String next = inputFile.nextLine();
+            String data;
+            int score;
+
+            // we've reached a result, make a node but dont recurse
+            if (next.startsWith("END:")) {
+                data = next.substring(4, next.lastIndexOf("-"));
+                score = Integer.parseInt(next.substring(next.lastIndexOf("-") + 1));
+                return new QuizTreeNode(data, score);
+            } 
+
+            // otherwise, we're not at the end yet, make a node and keep going
+            else {                 
+                data = next.substring(0, next.lastIndexOf("-"));
+                score = Integer.parseInt(next.substring(next.lastIndexOf("-") + 1));
+                root = new QuizTreeNode(data, score);
+                root.left = populateTree(inputFile, root.left);
+                root.right = populateTree(inputFile, root.right);
+            }
+        }
+        return root;
+    }
+
+    public void takeQuiz(Scanner console) {
+        takeQuiz(console, head);
+    }
+
+    private void takeQuiz(Scanner console, QuizTreeNode root) {
+        if (root.left != null && root.right != null) {
+            String left = root.data.substring(0, root.data.lastIndexOf("/"));
+            String right = root.data.substring(root.data.lastIndexOf("/")+1, root.data.length());
+            System.out.print("Do you prefer " + left + " or " + right + "? ");
+            String input = console.nextLine();
+
+            while (!input.equalsIgnoreCase(left) || !input.equalsIgnoreCase(right)) {
+                System.out.println("  Invalid response; try again.");
+                System.out.print("Do you prefer " + left + " or " + right + "? ");
+                input = console.nextLine();
+            }
+
+            takeQuiz(console, input.equalsIgnoreCase(left) ? root.left : root.right);
+        }
+        
+        else {
+            System.out.println("Your result is: " + root.data);
+            System.out.println("Your score is: " + root.score);
+        }
+    }
+
+    public void export(PrintStream outputFile) {
+        export(outputFile, this.head);
+    }
+
+    private void export(PrintStream outputFile, QuizTreeNode root) {
+        if (root.left == null && root.right == null) {
+            outputFile.println("END:" + root.data + "-" + root.score);
+        } else {
+            outputFile.println(root.data + "-" + root.score);
+        }
+
+        if (root.left != null) {
+            export(outputFile, root.left);
+        }
+        if (root.right != null) {
+            export(outputFile, root.right);
+        }
+    }
+
+    //public void addQuestion(String toReplace, String choices, String leftResult, String rightResult) {
+    //}
+
+    public void addQuestion(String toReplace, String choices, String leftResult, String rightResult) {
+        head = addQuestion(head, toReplace.toLowerCase(), choices, leftResult, rightResult);
+    }
+
+    private QuizTreeNode addQuestion(QuizTreeNode root, String toReplace, String choices, String leftResult, String rightResult) {
+        if (root == null) {
+            return null;
+        }
+
+        if (root.left == null && root.right == null && root.data.equalsIgnoreCase(toReplace)) {
+            // Parse choices to get left choice, right choice, and score
+            String choiceText = choices.substring(0, choices.lastIndexOf("-"));
+            int choiceScore = Integer.parseInt(choices.substring(choices.lastIndexOf("-") + 1));
+
+            // Create the new choice node
+            QuizTreeNode choiceNode = new QuizTreeNode(choiceText, choiceScore);
+
+            // Parse leftResult to get left result data and score
+            String leftData = leftResult.substring(0, leftResult.lastIndexOf("-"));
+            int leftScore = Integer.parseInt(leftResult.substring(leftResult.lastIndexOf("-") + 1));
+            QuizTreeNode leftNode = new QuizTreeNode(leftData, leftScore);
+
+            // Parse rightResult to get right result data and score
+            String rightData = rightResult.substring(0, rightResult.lastIndexOf("-"));
+            int rightScore = Integer.parseInt(rightResult.substring(rightResult.lastIndexOf("-") + 1));
+            QuizTreeNode rightNode = new QuizTreeNode(rightData, rightScore);
+
+            // Set the left and right children of the new choice node
+            choiceNode.left = leftNode;
+            choiceNode.right = rightNode;
+
+            return choiceNode;
+        } else {
+            root.left = addQuestion(root.left, toReplace, choices, leftResult, rightResult);
+            root.right = addQuestion(root.right, toReplace, choices, leftResult, rightResult);
+            return root;
+        }
+    }
+
+
+
+    public static class QuizTreeNode {
+
+        public final String data;
+        public final int score;
+        public QuizTreeNode left;
+        public QuizTreeNode right;
+
+        public QuizTreeNode(String data, int score) {
+            this(data, score, null, null);
+        }
+
+        public QuizTreeNode(String data, int score, QuizTreeNode left, QuizTreeNode right) {
+            this.data = data; 
+            this.score = score; 
+            this.left = left; 
+            this.right = right;
+        }
+    }
+}