Merge branch 'roman-numerals'

config.json

@@ -17,7 +17,8 @@
     "space-age",
     "gigasecond",
     "triangle",
-    "scrabble-score"
+    "scrabble-score",
+    "roman-numerals"
   ],
   "deprecated": [
   ],

roman-numerals/build.gradle

@@ -0,0 +1,11 @@
+apply plugin: "java"
+apply plugin: "eclipse"
+apply plugin: "idea"
+
+repositories {
+  mavenCentral()
+}
+
+dependencies {
+  testCompile "junit:junit:4.10"
+}

roman-numerals/example.java

@@ -0,0 +1,41 @@
+public class RomanNumeral {
+
+    private int arabicNumeral;
+
+    private static final Map<Integer, String> arabicToRomanConversions = new LinkedHashMap<>();
+
+    static {
+        arabicToRomanConversions.put(1000, "M");
+        arabicToRomanConversions.put(900, "CM");
+        arabicToRomanConversions.put(500, "D");
+        arabicToRomanConversions.put(400, "CD");
+        arabicToRomanConversions.put(100, "C");
+        arabicToRomanConversions.put(90, "XC");
+        arabicToRomanConversions.put(50, "L");
+        arabicToRomanConversions.put(40, "XL");
+        arabicToRomanConversions.put(10, "X");
+        arabicToRomanConversions.put(9, "IX");
+        arabicToRomanConversions.put(5, "V");
+        arabicToRomanConversions.put(4, "IV");
+        arabicToRomanConversions.put(1, "I");
+    }
+
+    public RomanNumeral(int arabicNumeral) {
+        this.arabicNumeral = arabicNumeral;
+    }
+
+
+    public String getRomanNumeral() {
+        StringBuilder romanNumeral = new StringBuilder();
+
+        for (Map.Entry<Integer, String> conversion : arabicToRomanConversions.entrySet()) {
+            while (arabicNumeral / conversion.getKey() > 0) {
+                arabicNumeral -= conversion.getKey();
+
+                romanNumeral.append(conversion.getValue());
+            }
+        }
+
+        return romanNumeral.toString();
+    }
+}

roman-numerals/src/main/java/RomanNumeral.java

@@ -0,0 +1,2 @@
+public class RomanNumeral {
+}

roman-numerals/src/test/java/RomanNumeralsTest.java

@@ -0,0 +1,53 @@
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import static org.junit.Assert.assertEquals;
+
+@RunWith(Parameterized.class)
+public class RomanNumeralsTest {
+
+    private int input;
+    private String expectedOutput;
+
+    @Parameters
+    public static Collection<Object[]> data() {
+        return Arrays.asList(new Object[][]{
+                {0, ""},
+                {1, "I"},
+                {2, "II"},
+                {3, "III"},
+                {4, "IV"},
+                {5, "V"},
+                {6, "VI"},
+                {9, "IX"},
+                {27, "XXVII"},
+                {48, "XLVIII"},
+                {59, "LIX"},
+                {93, "XCIII"},
+                {141, "CXLI"},
+                {163, "CLXIII"},
+                {402, "CDII"},
+                {575, "DLXXV"},
+                {911, "CMXI"},
+                {1024, "MXXIV"},
+                {3000, "MMM"}
+        });
+    }
+
+    public RomanNumeralsTest(int input, String expectedOutput) {
+        this.input = input;
+        this.expectedOutput = expectedOutput;
+    }
+
+    @Test
+    public void convertArabicNumberalToRomanNumeral() {
+        RomanNumeral romanNumeral = new RomanNumeral(input);
+
+        assertEquals(romanNumeral.getRomanNumeral(), expectedOutput);
+    }
+}