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 result;
        if (number ==1)
            return 1;
        result = factorial(number-1)*number;

        return result;
    }

    /**
     * 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 x = phrase.indexOf(' ');

        return phrase.substring(0,1).toUpperCase() + phrase.substring(x+1,x+2).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) {
return null;
}
}*/