completed week 1 quiz

LoopFun.java

@@ -7,8 +7,15 @@ public class LoopFun
        * @param number
        * @return the factorial of the number
        */
-      public int factorial(int number){
-          return -1;
+      public int factorial(int n){
+          int result = 0;
+          if(n == 0)
+          {
+              result = 1;
+          } else {
+              return n * factorial(n - 1);
+          }
+          return result;
       }
 
       /**
@@ -19,7 +26,29 @@ public class LoopFun
        * @return Upper case string of the first letter of each word
        */
       public String acronym(String phrase) {
-          return null;
+          //String result = "";
+          //String newString = "";
+          //String phra = phrase;
+          //String[] words = phra.split(" ");
+          //String word = words[0];
+          //if(word.length() > 0){
+            //  String[] letters = word.split("");
+            //  result += letters[0].toUpperCase();
+            //  newString = StringUtilities.searchReplaceFirst(phra, words[0], "");
+            //  return result += acronym(newString);
+          //}else{
+            //  return result;
+          //}
+          String result = "";
+          String[] words = phrase.split(" ");
+          
+          for(int i = 0; i < words.length; i ++)
+          {
+              String word = words[i];
+              String[] letters = word.split("");
+              result += letters[0].toUpperCase();
+          }
+          return result;
       }
 
       /**
@@ -35,6 +64,29 @@ public class LoopFun
        * @return the encrypted string by shifting each character by three character
        */
       public String encrypt(String word) {
-          return null;
+          char[] chars = word.toCharArray();
+          String result = "";
+          for(int i = 0; i < chars.length; i ++)
+          {
+              char currentChar = chars[i];
+              int charValue = (int)(currentChar);
+              
+              for(int m = 0; m < 3; m ++)
+              {
+                  charValue ++;
+                  if(charValue > 122)
+                  {
+                      charValue = 97;
+                  } 
+              }
+              
+              char newChar = (char)(charValue);
+              String charString = String.valueOf(newChar);
+              System.out.println(charString);
+              result += charString;
+              
+          }
+          
+          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 +25,9 @@ public class MathUtilities{
    * @return the half of the number in double
    */
   public double half(int number) {
-      return -1;
+      double temp = (double) number;
+      double result = temp / 2;
+      return result;
   }
 
   /**
@@ -34,7 +36,7 @@ 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 false;}else{return true;}
   }
 
 
@@ -44,7 +46,7 @@ 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 +1,54 @@
 public class StringUtilities {
+    
+    
    public Character getMiddleCharacter(String word){
-       return null;
+        char[] character = word.toCharArray();
+        int len = (character.length) / 2;
+        
+        if(character.length % 2 == 0)
+        {
+            return character[len];
+        } else {
+            return character[len];
+        }
    }
    
    public String removeCharacter(String value, char charToRemove){
-     return null;  
+       //store input at the time this is called
+       String n = value;
+       //convert the to be removed char to a string
+       String charString = String.valueOf(charToRemove);
+       //replace the char with an empty string - removing it from the string
+       //if there is nothing to remove, this function will return the original string
+       n = searchReplaceFirst(n , charString, "");
+       //if n is now still the same as the starting value, this means nothing could be replaced
+       if(n.equals(value)){
+          //return n since all occurences have been removed
+          return n;
+       //if n is now different from value, after the char has been replaced, recall this method.
+       }else{
+          //convert the string back to a character
+          char remove = charString.charAt(0);
+          //recursivly call this function on the updated string
+          return removeCharacter(n, remove); 
+       }
+   }
+   
+   public static String searchReplaceFirst(String value, String replace, String replacement){
+       //if the two values are the same after something has been replaced, this means nothing has been replaced
+       if(value.equals(value.replaceFirst(replace, replacement)))
+       {
+           //so return the original string
+           return value;
+       //otherwise, this means something has been replaced
+       } else {
+          //return the new value
+          return value.replaceFirst(replace, replacement);
+       }
    }
    
    public String getLastWord(String value) {
-       return null;
+       String[] result = value.split(" ");
+       return result[result.length - 1];
    }
 }

package.bluej

@@ -2,25 +2,25 @@
 dependency1.from=StringUtilitiesTest
 dependency1.to=StringUtilities
 dependency1.type=UsesDependency
-dependency2.from=BonusTest
-dependency2.to=Bonus
+dependency2.from=LoopFunTest
+dependency2.to=LoopFun
 dependency2.type=UsesDependency
 dependency3.from=MathUtilitiesTest
 dependency3.to=MathUtilities
 dependency3.type=UsesDependency
-editor.fx.0.height=722
-editor.fx.0.width=876
-editor.fx.0.x=158
-editor.fx.0.y=216
-objectbench.height=164
+editor.fx.0.height=777
+editor.fx.0.width=1280
+editor.fx.0.x=0
+editor.fx.0.y=23
+objectbench.height=149
 objectbench.width=669
 package.divider.horizontal=0.6
-package.divider.vertical=0.7628294036061026
-package.editor.height=543
+package.divider.vertical=0.7632776934749621
+package.editor.height=496
 package.editor.width=567
-package.editor.x=557
-package.editor.y=43
-package.frame.height=779
+package.editor.x=406
+package.editor.y=57
+package.frame.height=717
 package.frame.width=693
 package.numDependencies=3
 package.numTargets=6
@@ -40,20 +40,19 @@ target1.width=110
 target1.x=110
 target1.y=150
 target2.height=50
-target2.name=BonusTest
+target2.name=LoopFunTest
 target2.showInterface=false
 target2.type=UnitTestTargetJunit4
-target2.width=80
-target2.x=120
-target2.y=270
-target3.association=BonusTest
+target2.width=110
+target2.x=10
+target2.y=240
 target3.height=50
-target3.name=Bonus
+target3.name=LoopFun
 target3.showInterface=false
 target3.type=ClassTarget
 target3.width=80
-target3.x=90
-target3.y=300
+target3.x=200
+target3.y=210
 target4.association=MathUtilitiesTest
 target4.height=50
 target4.name=MathUtilities