Loops and Tables

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

@@ -3,26 +3,65 @@
 
 public class NumberUtilities {
     public static String getEvenNumbers(int start, int stop) {
-        return null;
-    }
+        StringBuilder evenNum = new StringBuilder();
+
+        for (int i = start; i < stop; i++){
+            if (i % 2 == 0){
+                evenNum.append(i);
+            }
 
+        }
+        return evenNum.toString();
+    }
 
     public static String getOddNumbers(int start, int stop) {
-        return null;
+        StringBuilder oddNum = new StringBuilder();
+
+        for (int i = start; i < stop; i++){
+            if (i % 2 != 0){
+                oddNum.append(i);
+            }
+        }
+        return oddNum.toString();
     }
 
 
     public static String getSquareNumbers(int start, int stop, int step) {
-        return null;
+        StringBuilder squareNum = new StringBuilder();
+
+        for (int i = start; i < stop; i = i + step){
+            if (i < stop){
+              int square = (int) Math.pow(i,2);
+                squareNum.append(square);
+            }
+
+        }
+        return squareNum.toString();
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+
+        StringBuilder range = new StringBuilder();
+
+        for (int i = start; i < stop; i += step){
+            if (i < stop){
+                range.append(i);
+            }
+        }
+        return range.toString();
     }
 
 
     public static String getExponentiations(int start, int stop, int step, int exponent) {
-        return null;
+        StringBuilder expoNum = new StringBuilder();
+
+        for (int i = start; i < stop; i += step){
+            if (i < stop){
+                int expo = (int) Math.pow(i,exponent);
+                expoNum.append(expo);
+            }
+        }
+        return expoNum.toString();
     }
 }

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

@@ -2,14 +2,28 @@
 
 public class TableUtilities {
     public static String getSmallMultiplicationTable() {
-        return null;
+        StringBuilder multiTable = new StringBuilder();
+        for (int i = 1; i < 6; i++){
+            for (int j = 1; j < 6; j++){
+                multiTable.append(String.format("%3d |", i * j));
+            }
+            multiTable.append("\n");
+        }
+        return multiTable.toString();
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+        return getMultiplicationTable(10);
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+        StringBuilder multiTable = new StringBuilder();
+        for (int i = 1; i < tableSize + 1; i++){
+            for (int j = 1; j < tableSize + 1; j++){
+                multiTable.append(String.format("%3d |", i * j));
+            }
+            multiTable.append("\n");
+        }
+        return multiTable.toString();
     }
 }

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

@@ -3,18 +3,55 @@
 public class TriangleUtilities {
 
     public static String getTriangle(int numberOfRows) {
-        return null;
+        StringBuilder smallTri = new StringBuilder();
+
+        String star = "*";
+
+        for (int i = 1; i < numberOfRows; i++){
+            for (int j = 0; j < i; j++) {
+                smallTri.append(star);
+            }
+            smallTri.append("\n");
+        }
+        return smallTri.toString();
     }
 
     public static String getRow(int numberOfStars) {
-        return null;
+        StringBuilder stars = new StringBuilder();
+
+        String asterisk = "*";
+
+        for (int i = 0; i < numberOfStars; i++){
+            stars.append(asterisk);
+        }
+        return stars.toString();
     }
 
     public static String getSmallTriangle() {
-        return null;
+        StringBuilder smallTri = new StringBuilder();
+
+        String star = "*";
+
+        for (int i = 1; i < 5; i++){
+            for (int j = 0; j < i; j++) {
+                smallTri.append(star);
+            }
+        smallTri.append("\n");
+        }
+        return smallTri.toString();
     }
 
     public static String getLargeTriangle() {
-        return null;
+        StringBuilder smallTri = new StringBuilder();
+
+        String star = "*";
+
+        for (int i = 1; i < 10; i++){
+            for (int j = 0; j < i; j++) {
+                smallTri.append(star);
+            }
+            smallTri.append("\n");
+        }
+        return smallTri.toString();
     }
 }

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

@@ -49,29 +49,29 @@ public void testGetRange2() {
 
 
     @Test
-    public void testGetEvenNumbers() {
+    public void testGetOddNumbers() {
         // : Given
         String expected = "5791113151719";
         int start = 5;
         int stop = 20;
 
         // : When
-        String actual = NumberUtilities.getEvenNumbers(start, stop);
+        String actual = NumberUtilities.getOddNumbers(start, stop);
 
         // : Then
         Assert.assertEquals(expected, actual);
     }
 
     @Test
-    public void testGetOddNumbers() {
+    public void testGetEvenNumbers() {
         // : Given
         String expected = "681012141618";
         int start = 5;
         int stop = 20;
         int step = 5;
 
         // : When
-        String actual = NumberUtilities.getOddNumbers(start, stop);
+        String actual = NumberUtilities.getEvenNumbers(start, stop);
 
         // : Then
         Assert.assertEquals(expected, actual);