Loop d Loop

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

@@ -1,28 +1,62 @@
 package io.zipcoder.microlabs.mastering_loops;
-
+import java.lang.*;
 
 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 sqNum = new StringBuilder();
+
+        for (int i = start; i < stop; i+=step) {
+            sqNum.append(Math.round(Math.pow(i, 2)));
+        }
+        return sqNum.toString();
     }
 
 
     public static String getRange(int start, int stop, int step) {
-        return null;
+
+        StringBuilder rangeNum = new StringBuilder();
+
+        for (int i = start; i < stop; i+=step) {
+            rangeNum.append(i);
+        }
+        return rangeNum.toString();
+
     }
 
 
     public static String getExponentiations(int start, int stop, int step, int exponent) {
-        return null;
+
+        StringBuilder exponentNum = new StringBuilder();
+
+        for (int i = start; i < stop; i+=step) {
+            exponentNum.append(Math.round(Math.pow(i, exponent)));
+        }
+        return exponentNum.toString();
     }
 }

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

@@ -1,15 +1,28 @@
 package io.zipcoder.microlabs.mastering_loops;
 
 public class TableUtilities {
+
     public static String getSmallMultiplicationTable() {
-        return null;
+
+        return getMultiplicationTable(5);
     }
 
     public static String getLargeMultiplicationTable() {
-        return null;
+
+        return getMultiplicationTable(10);
     }
 
     public static String getMultiplicationTable(int tableSize) {
-        return null;
+        StringBuilder matrix = new StringBuilder();
+
+        for(int row = 1; row <= tableSize; row++) {
+            for(int col = 1; col <= tableSize; col++){
+                matrix.append(String.format("%3d |", row * col));
+            }
+            matrix.append("\n");
+        }
+        return matrix.toString();
     }
 }
+
+

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

@@ -3,18 +3,38 @@
 public class TriangleUtilities {
 
     public static String getTriangle(int numberOfRows) {
-        return null;
+
+        String triangleContainer = "";
+
+        for (int row=1; row < numberOfRows; row++)
+        {
+            for (int column=0; column<row; column++)
+            {
+               triangleContainer += "*";
+            }
+            triangleContainer += "\n";
+        }
+        return triangleContainer;
     }
 
     public static String getRow(int numberOfStars) {
-        return null;
+
+        String triangleContainer = "";
+
+        for (int row=0; row < numberOfStars; row++)
+        {
+            triangleContainer += "*";
+        }
+        return triangleContainer;
     }
 
     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 +65,9 @@ public void testGetEvenNumbers() {
     @Test
     public void testGetOddNumbers() {
         // : Given
-        String expected = "681012141618";
+        String expected = "5791113151719";
         int start = 5;
         int stop = 20;
-        int step = 5;
 
         // : When
         String actual = NumberUtilities.getOddNumbers(start, stop);