QuizWeek1/LoopFun.java

package QuizWeek1;

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){ 
         int factorial = 0; 
         int i = 0;
          while (i <= number){
              i*=i;
              i++;
              
            }
          return factorial;
      }

      /**
       * 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) {
          int spaceIndex = phrase.indexOf(" ");
          char acro = phrase.charAt(spaceIndex+1);
          for (int i = 1; i < phrase.length(); i++){
              acro = Character.toUpperCase(phrase.charAt(spaceIndex+1));
            }
          
          return Character.toUpperCase(phrase.charAt(0)) + Character.toString(acro);
      }

      /**
       * 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;
      }
}