made readme

.idea/compiler.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <annotationProcessing>
+      <profile name="Maven default annotation processors profile" enabled="true">
+        <sourceOutputDir name="target/generated-sources/annotations" />
+        <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
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+        <module name="Samples" />
+      </profile>
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.idea/libraries/Maven__junit_junit_4_0.xml

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.idea/misc.xml

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.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
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+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
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+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
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+</project>

.idea/workspace.xml

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+      <hideEmptyPackages />
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+      <autoscrollToSource />
+      <autoscrollFromSource />
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+      <window_info id="Theme Preview" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="-1" side_tool="false" content_ui="tabs" />
+      <window_info id="Debug" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
+      <window_info id="Favorites" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="-1" side_tool="true" content_ui="tabs" />
+      <window_info id="Cvs" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
+      <window_info id="Hierarchy" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="2" side_tool="false" content_ui="combo" />
+      <window_info id="Message" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="0" side_tool="false" content_ui="tabs" />
+      <window_info id="Commander" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="0" side_tool="false" content_ui="tabs" />
+      <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
+      <window_info id="Inspection" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="5" side_tool="false" content_ui="tabs" />
+    </layout>
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="1" />
+  </component>
+  <component name="VcsContentAnnotationSettings">
+    <option name="myLimit" value="2678400000" />
+  </component>
+  <component name="XDebuggerManager">
+    <breakpoint-manager />
+    <watches-manager />
+  </component>
+  <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/pom.xml">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="0">
+          <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/test/java/Question1Test.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="136">
+          <caret line="8" column="37" lean-forward="false" selection-start-line="8" selection-start-column="37" selection-end-line="8" selection-end-column="37" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/Question1.java">
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+        <state relative-caret-position="-302">
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+          <folding>
+            <element signature="e#1408#1409#0" expanded="true" />
+            <element signature="e#1456#1457#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/README.md">
+      <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
+        <state split_layout="SPLIT">
+          <first_editor relative-caret-position="102">
+            <caret line="6" column="39" lean-forward="false" selection-start-line="6" selection-start-column="39" selection-end-line="6" selection-end-column="39" />
+            <folding />
+          </first_editor>
+          <second_editor />
+        </state>
+      </provider>
+    </entry>
+  </component>
+  <component name="masterDetails">
+    <states>
+      <state key="ProjectJDKs.UI">
+        <settings>
+          <last-edited>1.8</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>

README.md

@@ -0,0 +1,21 @@
+# Riddle Me This
+
+There are 6 pieces of code in the Question1 class.
+
+Each does something.
+
+Your job is to figure out what each one does.
+
+Add a comment in front of each method describing what you think
+it does.
+
+In Question1Test, there are a number of runs of inputs.
+
+Run all the tests, (or just the one for the method you're trying to figure out)
+and look at the outputs. The inputs and outputs should
+give you some ideas as to what the method does.
+
+when you have figured out each method, do a commit.
+Then do a PR on the original repo.
+
+

Samples.iml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_5">
+    <output url="file://$MODULE_DIR$/target/classes" />
+    <output-test url="file://$MODULE_DIR$/target/test-classes" />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Maven: junit:junit:4.0" level="project" />
+  </component>
+</module>

pom.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>rocks.zipcode.sample</groupId>
+    <artifactId>Samples</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.0</version>
+        </dependency>
+    </dependencies>
+
+
+</project>

src/main/java/Question1.java

@@ -0,0 +1,89 @@
+public class Question1 {
+
+    public static void doSomething0() {
+        int s = 6;
+
+        int r = (int) (Math.random() * s) + 1;
+
+        System.out.println(r);
+    }
+
+    public static void doSomething1(int n) {
+        int foo = 1;
+
+        while (foo <= n / 2) {
+            foo *= 2;
+        }
+
+        while (foo > 0) {
+
+            if (n < foo) {
+                System.out.print(0);
+            } else {
+                System.out.print(1);
+                n -= foo;
+            }
+
+            foo /= 2;
+        }
+
+        System.out.println();
+    }
+
+    public static void doSomething2(int n) {
+        int i = 0;
+        int p = 1;
+
+
+        while (i <= n) {
+            System.out.println(i + " " + p);
+            p = 2 * p;
+            i = i + 1;
+        }
+    }
+
+    public static void doSomething3(double c) {
+        double epsilon = 1e-15;
+        double t = c;
+
+        while (Math.abs(t - c/t) > epsilon*t) {
+            t = (c/t + t) / 2.0;
+        }
+
+        System.out.println(t);
+    }
+
+    public static void doSomething4(double x) {
+        x = x % (2 * Math.PI);
+
+        double term = 1.0;
+        double sum  = 0.0;
+
+        for (int i = 1; term != 0.0; i++) {
+            term *= (x / i);
+            if (i % 4 == 1) sum += term;
+            if (i % 4 == 3) sum -= term;
+        }
+        System.out.printf("%.4f\t%.8f\n", x, sum);
+    }
+
+    public static int getInt(int n) {
+        return (int) (Math.random() * n);
+    }
+
+    public static int doSomething5(int n) {
+        boolean[] a = new boolean[n];
+        int k = 0;
+        int d  = 0;
+
+        while (d < n) {
+            int value = getInt(n);
+            k++;
+            if (!a[value]) {
+                d++;
+                a[value] = true;
+            }
+        }
+        return k;
+    }
+}

src/test/java/Question1Test.java

@@ -0,0 +1,66 @@
+import static org.junit.Assert.*;
+
+public class Question1Test {
+
+    @org.junit.Test
+    public void doSomething0() {
+        System.out.println("\ndoS0:\n");
+        for (int i = 0; i <= 20; i++)
+            Question1.doSomething0();
+    }
+
+    @org.junit.Test
+    public void doSomething1() {
+        System.out.println("\ndoS1:\n");
+
+        Question1.doSomething1(2340);
+        Question1.doSomething1(5);
+        Question1.doSomething1(1456234);
+    }
+
+    @org.junit.Test
+    public void doSomething2() {
+        System.out.println("\ndoS2:\n");
+
+        Question1.doSomething2(4);
+        Question1.doSomething2(12);
+        Question1.doSomething2(31);
+        Question1.doSomething2(9);
+    }
+
+    @org.junit.Test
+    public void doSomething3() {
+        System.out.println("\ndoS3:\n");
+
+        Question1.doSomething3(2.0);
+        Question1.doSomething3(225.0);
+        Question1.doSomething3(5.0);
+        Question1.doSomething3(16.0);
+    }
+
+    @org.junit.Test
+    public void doSomething4() {
+        System.out.println("\ndoS4:\n");
+
+        Question1.doSomething4(1.0);
+        Question1.doSomething4(0.5);
+        Question1.doSomething4(-1.0);
+        Question1.doSomething4(0.0);
+        Question1.doSomething4(360.0);
+    }
+
+    @org.junit.Test
+    public void doSomething5() {
+        System.out.println("\ndoS5:\n");
+
+        int x1 = 13;
+        int x = Question1.doSomething5(x1);
+        System.out.printf("%d %d\n", x1, x);
+        x1 = 25;
+        x = Question1.doSomething5(x1);
+        System.out.printf("%d %d\n", x1, x);
+        x1 = 52;
+        x = Question1.doSomething5(x1);
+        System.out.printf("%d %d\n", x1, x);
+    }
+}