Lab quiz

LoopFun.java

@@ -1,40 +1,58 @@
 public class LoopFun
 {
 
-      /**
-       * Given a number, return the factorial of that number.
-       * For example, given 5, the factorial is 5 x 4 x 3 x 2 x 1 which should return 120.
-       * @param number
-       * @return the factorial of the number
-       */
-      public int factorial(int number){
-          return -1;
-      }
+    /**
+     * Given a number, return the factorial of that number.
+     * For example, given 5, the factorial is 5 x 4 x 3 x 2 x 1 which should return 120.
+     * @param number
+     * @return the factorial of the number
+     */
+    public int factorial(int number){
+        for(int i=1; i<= number; i++){
+            return number * i;
+        }
+        return number;
+    }
 
-      /**
-       * Given a phrase, get the acronym of that phrase. Acronym is the combination of
-       * the first character of each word in upper case.
-       * For example, given "Ruby on Rails", this method will return "ROR"
-       * @param phrase
-       * @return Upper case string of the first letter of each word
-       */
-      public String acronym(String phrase) {
-          return null;
-      }
+    /**
+     * Given a phrase, get the acronym of that phrase. Acronym is the combination of
+     * the first character of each word in upper case.
+     * For example, given "Ruby on Rails", this method will return "ROR"
+     * @param phrase
+     * @return Upper case string of the first letter of each word
+     */
+    public String acronym(String phrase) {
 
-      /**
-       * To prevent anyone from reading our messages, we can encrypt it so it will only be readable by its
-       * intended audience. This method encrypt the message by shifting the letter by 3 characters. If the character is
-       * at the end of the alphabet, it will wraps around.
-       * For example:
-       *  'a' => 'd'
-       *  'w' => 'z'
-       *  'x' => 'a'
-       *  'y' => 'b'
-       * @param word
-       * @return the encrypted string by shifting each character by three character
-       */
-      public String encrypt(String word) {
-          return null;
-      }
+        String []acronym = phrase.split(" ");
+
+        for (int i = 0; i < acronym.length; i++) {
+            String s = acronym[i];
+            s.charAt(0);
+        }
+
+        return s.toUpperCase();
+    }
+
+    /**
+     * To prevent anyone from reading our messages, we can encrypt it so it will only be readable by its
+     * intended audience. This method encrypt the message by shifting the letter by 3 characters. If the character is
+     * at the end of the alphabet, it will wraps around.
+     * For example:
+     *  'a' => 'd'
+     *  'w' => 'z'
+     *  'x' => 'a'
+     *  'y' => 'b'
+     * @param word
+     * @return the encrypted string by shifting each character by three character
+     */
+    public String encrypt(String word) {
+        
+        char [] encodeWord= word.toCharArray();
+        for (int i= 0; i <encodeWord.length(); i++){
+            if (Character.isLetter(encodeWord[i])){
+                encodeWord[i]+=3;}
+        }
+         
+        return encodeWord;
+    }
 }

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 +25,8 @@ public class MathUtilities{
    * @return the half of the number in double
    */
   public double half(int number) {
-      return -1;
+      double num= number/ 2;
+      return (double )num;
   }
 
   /**
@@ -34,6 +35,9 @@ public class MathUtilities{
    * @return true if the number is odd, false if it is even
    */
   public boolean isOdd(int number){
+    
+     
+    
       return false;
   }
 
@@ -44,7 +48,7 @@ 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 +1,30 @@
 public class StringUtilities {
    public Character getMiddleCharacter(String word){
-       return null;
+       int post;
+        int leng;
+        if (word.length()% 2 == 1){
+            post=word.length()/2;
+            leng= 1;
+        } else {
+            post=word.length()/2-1;
+            leng = 1; 
+        }
+        String mid = word.substring(post, post
+                + leng);
+                char output = mid.charAt(0);
+        return output;
+       
    }
-   
+  
    public String removeCharacter(String value, char charToRemove){
-     return null;  
+       
+     String newString = value.replaceAll(Character.toString(charToRemove), "");
+     
+     return newString;  
    }
    
    public String getLastWord(String value) {
-       return null;
+       String lastWord = value.substring(value.lastIndexOf(" ")+1);
+       return lastWord;
    }
 }