/**
 * Grade
 *
 * Convert from numerical grade to letter grade, using
 * the standard high-school scale (0-59 F, 60-62 D-, ...)
 *
 * David Liben-Nowell
 * CS 127 (Winter 2006, Carleton College)
 */

class Grade {

    // notice that this method must be static in order for the
    // main method below to invoke it.  If you remove "static", you'll get the
    // following compilation error message:
    //   "non-static method toGrade(int) cannot be referenced from
    //       a static context"
    public String toGrade(int grade) {
	String str;
	if (grade >= 90) {
	    str = "A";
	} else if (grade >= 80) {
	    str = "B";
	} else if (grade >= 70) {
	    str = "C";
	} else if (grade >= 60) {
	    str = "D";
	} else {
	    str = "F";
	}

	// A "minus" grade is x0, x1, or x2 where x is one of 6/7/8/9.
	if ((grade % 10 <= 2) && (grade >= 60) && (grade <= 92)) {
	    str = str + "-";
	}

	// added after class:
	// A "plus" grade is 100, or x8 or x9 where x is one of 6/7/8/9.
	if (((grade % 10 >= 8) && (grade >= 60)) || (grade >= 98)) {
	    str = str + "+";
	}

	return str;
    }

    public static void main(String[] args) {
	// the following was also added after class; it's a loop to
	// show grades for all scores between 0 and 100.
	int grade = 0;
	while (grade <= 100) {
	    System.out.println("A " + grade + " is a " + toGrade(grade));
	    grade = grade + 1;
	}
    }

}