Two meltdowns and one cup of coffee later

src/main/java/io/zipcoder/microlabs/mastering_loops/NumberUtilities.java

@@ -1,28 +1,54 @@
 package io.zipcoder.microlabs.mastering_loops;
 
+import java.util.ArrayList;
 
 public class NumberUtilities {
     public static String getEvenNumbers(int start, int stop) {
-        return null;
+        String evenResults = "";
+        for (int i = start; i < stop; i++) {
+            if (i % 2 == 0) {
+                evenResults += i;
+            }
+        }
+        return evenResults;
     }
 
-
     public static String getOddNumbers(int start, int stop) {
-        return null;
+        String oddResults = "";
+        for (int i = start; i < stop; i++) {
+            if (i % 2 != 0) {
+                oddResults += i;
+            }
+        }
+        return oddResults;
     }
 
 
     public static String getSquareNumbers(int start, int stop, int step) {
-        return null;
+        String squareItUpMyDude = "";
+        for (int i = start; i < stop; i+=step) {
+            int j = i * i;
+            squareItUpMyDude += j;
+        }
+        return squareItUpMyDude;
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+        String totalRange = "";
+        for (int i = start; i < stop; i+=step) {
+            totalRange += i;
+        }
+        return totalRange;
     }
 
 
     public static String getExponentiations(int start, int stop, int step, int exponent) {
-        return null;
+        String exponentTimeMofo = "";
+        for (int i = start; i < stop; i+=step) {
+            int j = (int)Math.round(Math.pow(i, exponent));
+            exponentTimeMofo += j;
+        }
+        return exponentTimeMofo;
     }
 }

src/main/java/io/zipcoder/microlabs/mastering_loops/TableUtilities.java

@@ -2,14 +2,32 @@
 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+        int width = (int)Math.floor(Math.log10(5 * 5)) + 2;
+        String format = "%" + width + "d |";
+        StringBuilder b = new StringBuilder(5 * width);
+        for (int row = 1; row <= 5; row++) {
+            for (int col = 1; col <= 5; col++) {
+                b.append(String.format(format, row * col));
+            }
+            b.append("\n");
+        }
+        return b.toString();
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+        return getMultiplicationTable(10);
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+        int width = (int)Math.floor(Math.log10(tableSize * tableSize)) + 1;
+        String format = "%" + width + "d |";
+        StringBuilder b = new StringBuilder(tableSize * width);
+        for (int row = 1; row <= tableSize; row++) {
+            for (int col = 1; col <= tableSize; col++) {
+                b.append(String.format(format, row * col));
+            }
+            b.append("\n");
+        }
+        return b.toString();
     }
 }

src/main/java/io/zipcoder/microlabs/mastering_loops/TriangleUtilities.java

@@ -1,20 +1,31 @@
 package io.zipcoder.microlabs.mastering_loops;
 
+import java.lang.*;
+
 public class TriangleUtilities {
 
     public static String getTriangle(int numberOfRows) {
-        return null;
+        StringBuilder customTri = new StringBuilder("");
+        for (int i = 1; i <= numberOfRows - 1; i++) {
+            customTri.append(getRow(i));
+            customTri.append("\n");
+        }
+        return customTri.toString();
     }
 
     public static String getRow(int numberOfStars) {
-        return null;
+        StringBuilder rowStarString = new StringBuilder("");
+        for (int i = 0; i < numberOfStars; i++) {
+            rowStarString.append("*");
+        }
+        return rowStarString.toString();
     }
 
     public static String getSmallTriangle() {
-        return null;
+        return getTriangle(5);
     }
 
     public static String getLargeTriangle() {
-        return null;
+        return getTriangle(10);
     }
 }

src/test/java/io/zipcoder/microlabs/mastering_loops/NumberUtilitiesTest.java

@@ -51,7 +51,7 @@ public void testGetRange2() {
     @Test
     public void testGetEvenNumbers() {
         // : Given
-        String expected = "5791113151719";
+        String expected = "681012141618";
         int start = 5;
         int stop = 20;
 
@@ -65,10 +65,10 @@ public void testGetEvenNumbers() {
     @Test
     public void testGetOddNumbers() {
         // : Given
-        String expected = "681012141618";
+        String expected = "5791113151719";
         int start = 5;
         int stop = 20;
-        int step = 5;
+        // int step = 5;  <This isn't supposed to be here right?
 
         // : When
         String actual = NumberUtilities.getOddNumbers(start, stop);
@@ -107,6 +107,7 @@ public void testGetExponentiationNumbers() {
         // : When
         String actual = NumberUtilities.getExponentiations(start, stop, step, exponent);
 
+        // : Then
         Assert.assertEquals(expected, actual);
     }
 }