public class Conditional
{
    /**
     * This computes the positive part of a number
     * @param x the number we are computing the positive  part of
     * @return x if x > 0 and 0 otherwise.
     */
    public static double positivePart(double x)
    {
        return 0;
    }
    /**
     * This computes the negative part of a number
     * @param x the number we are computing the negative  part of
     * @return -x if x < 0 and 0 otherwise.
     */
    public static double negativePart(double x)
    {
        return 0;
    }
    /**
     * Use this to check sufficient closeness of floating-point numbers
     */
    public static boolean closeEnough(double x, double y)
    {
        return Math.abs(x - y) < 1e-6;
    }
    /**
     * This implements a stepwise defined function
     * @param x the argument of this function
     * @return 4 - x*x if x &lt; -2, 0 if |x| &lt;= 2 and x - 2 otherwise
     */
    public static double mathCheese(double x)
    {
        return 0;
    }
    /**
     * This checks if an alphabetical string is in the
     * first half of the alphabeet.
     * @param s the String to be checked; this string must contain
     * only alphabetical characters and this check is case-insensitive
     * @return true if the s starts with a-m and false otherwise.
     */
    public static boolean isInFirstHalfOfAlphabet(String s)
    {
        return false;
    }
    /**
     * This assigns a letter grade on a ten-point scale
     * @param score a final average of grades
     * @return "A" if the score is 90 or above, "B" if the score is 
     * 80 or above, etc.  IF the score is under 60, return "F"
     */
    public static String assignLetterGrade(int score)
    {
        return "";
    }
    /**
     * This implements +/- grading.  The grade of F gets no +- modifier.
     * @return "+" if the second digit of the grade is 8 or higher,
     * a "-" if the second digit of the grade is 2 or lower, and
     * a "" otherwise.  Special note: any score of 98 or higher is an A+;
     * an average can exceed 100.
     */
    public static String assignPlusMinus(int score)
    {
        return "";
    }
    /**
     * This assigns the full grade
     * @param score the final average
     * @return a +- grade for the average
     */
    public static String assignGrade(int score)
    {
        return "";
    }
    public static void main(String[] args)
    {
        //test your functions in here.  Example
        System.out.println("Testing positivePart:");
        double x = 5;
        System.out.printf("Case x = %s: %s\n",  x,  closeEnough(5, positivePart(x)));
        x = 0;
        System.out.printf("Case x = %s: %s\n",  x,  closeEnough(0, positivePart(x)));
        x = -5;
        System.out.printf("Case x = %s: %s\n",  x,  closeEnough(0, positivePart(x)));
        System.out.println("Testing negativePart:");
        System.out.println("Testing mathCheese:");
        System.out.println("Testing isInFirstHalfOfAlphabet:");
        String test = "naiman";
        System.out.printf("Case x = %s: %s\n", test , !isInFirstHalfOfAlphabet(test)); 
        System.out.println("Testing assignGrade:");
    }
}