wrote methods for math utilities and string utilities and some loops

LoopFun.java

@@ -8,7 +8,12 @@ public class LoopFun
        * @return the factorial of the number
        */
       public int factorial(int number){
-          return -1;
+          int result = 1;
+          for(int i=1; i<=number; i++){
+              result = result * i;
+              System.out.println();
+            }
+          return result;
       }
 
       /**

MathUtilities.java

@@ -6,7 +6,7 @@ public class MathUtilities{
    * @return the sum of the two numbers
    */
   public int add(int num1, int num2){
-      return -1;
+      return (num1 + num2);
   }
 
   /**
@@ -16,7 +16,7 @@ public class MathUtilities{
    * @return the sum of the two numbers
    */
   public double add(double num1, double num2){
-      return -1;
+      return (num1 + num2);
   }
 
   /**
@@ -25,7 +25,7 @@ public class MathUtilities{
    * @return the half of the number in double
    */
   public double half(int number) {
-      return -1;
+      return (number/2.0);
   }
 
   /**
@@ -34,7 +34,7 @@ public class MathUtilities{
    * @return true if the number is odd, false if it is even
    */
   public boolean isOdd(int number){
-      return false;
+      return ((number%2) == 1);
   }
 
 
@@ -44,7 +44,7 @@ public class MathUtilities{
    * @return the result of the number multiply by itself
    */
   public int square(int number) {
-      return -1;
+      return (number * number);
   }
 
 }

StringUtilities.java

@@ -1,13 +1,18 @@
+import java.util.*;
+
+
 public class StringUtilities {
-   public Character getMiddleCharacter(String word){
-       return null;
-   }
-   
-   public String removeCharacter(String value, char charToRemove){
-     return null;  
-   }
-   
-   public String getLastWord(String value) {
-       return null;
-   }
+    public Character getMiddleCharacter(String word){
+        double middleIndex = word.length()/2;
+        return (word.charAt((int)middleIndex));
+    }
+
+    public String removeCharacter(String value, char charToRemove){
+        return (value.replace(String.valueOf(charToRemove), ""));  
+    }
+
+    public String getLastWord(String value) {
+        int lastSpaceIndex = value.lastIndexOf(" ");
+        return value.substring(lastSpaceIndex+1);
+    }
 }