completed the quiz

LoopFun.java

@@ -8,7 +8,10 @@ public class LoopFun
        * @return the factorial of the number
        */
       public int factorial(int number){
-          return -1;
+          int fact =1;
+          for(int i=1;i<=number;i++)
+            fact *=i;
+          return fact;
       }
 
       /**
@@ -19,7 +22,14 @@ public class LoopFun
        * @return Upper case string of the first letter of each word
        */
       public String acronym(String phrase) {
-          return null;
+          
+        String ar[] = phrase.split(" ");
+        phrase ="";
+        for(String p : ar) {
+            phrase += p.substring(0,1).toUpperCase();
+        }
+        //System.out.println(phrase); 
+          return phrase;
       }
 
       /**
@@ -35,6 +45,11 @@ public class LoopFun
        * @return the encrypted string by shifting each character by three character
        */
       public String encrypt(String word) {
+         
+        String encrypted = "";
+        for(int i = 0;i<word.length();i++){
+            encrypted += (char)(word.charAt(i) + 3);
+        }
           return null;
       }
 }

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 (double)number/2;
   }
 
   /**
@@ -34,7 +34,10 @@ public class MathUtilities{
    * @return true if the number is odd, false if it is even
    */
   public boolean isOdd(int number){
-      return false;
+      if(number%2!=0)
+        return true;
+      else
+        return false ;
   }
 
 
@@ -44,7 +47,7 @@ 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 +1,47 @@
 public class StringUtilities {
    public Character getMiddleCharacter(String word){
-       return null;
+       if(word.length()%2 == 0){
+            return word.charAt(word.length()/2);
+        }
+        else{
+            return word.charAt(word.length()/2);
+        }
    }
    
    public String removeCharacter(String value, char charToRemove){
-     return null;  
+       StringBuilder b = new StringBuilder(value);
+       /*for(int i=0;i<value.length;i++)
+        if(value.charAt(i) == charToRemove)
+            value.charAt(i+1) = 
+            */
+           
+       for(int i=0;i<b.length();i++){
+           if(b.charAt(i) == charToRemove){
+               b.deleteCharAt(i);
+                if(i<b.length() && b.charAt(i) == charToRemove)
+                    b.deleteCharAt(i); 
+                    if(i<b.length() && b.charAt(i) == charToRemove)
+                        b.deleteCharAt(i);
+            }
+            }
+       value ="";
+       value = String.format("%s",b.toString());
+       
+       /*String newString ="";
+       
+       for(int i=0;i<value.length();i++){
+           if(value.charAt(i) == charToRemove){
+            newString = value.substring(0,i)+value.substring(i+1);
+            break;
+           }
+        }*/
+       return value;  
    }
    
    public String getLastWord(String value) {
-       return null;
+         String ar[] = value.split(" ");
+      
+       
+       return ar[(ar.length-1)];
    }
 }