QuizWeek1/LoopFun.java

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 total = 1;
          for(int i = number; i > 0; i--){
            total = i * total;
          }
          return total;
      }

      /**
       * 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) {
          StringBuilder finalString = new StringBuilder();
          //ALWAYS TAKES FIRST LETTER
          finalString.append(phrase.charAt(0));
          for(int i = 0; i < phrase.length(); i++){
          //CHECKS IF THERES A SPACE
              if(phrase.charAt(i) == ' ') {  
                //IF THERE IS IT ADD IT TO OUR STRING
                i++;
                finalString.append(phrase.charAt(i));
            }
          }
          //TURNS STRINGBUILDER INTO STRING
          String answer = "" + finalString;
          //MAKES STRING ALL CAPITALS
          return answer.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) {
          String newString = "";
          for(int i = 0; i < word.length(); i++){
              char encrypted = word.charAt(i);
              int number = (int) encrypted;
              if(number <= 119){
              char newChar = (char)(number + 3);
              newString = newString + newChar;
              } else if(number >= 118){
              char newChar = (char)(number - 23);
              newString = newString + newChar;
              }
            }
            System.out.println((char) 97);
          return newString;
      }
}