import java.util.Scanner;

public class GradeDistribution {

    private int[] starCount;
    private double countAccepted;
    private int grade;


    public GradeDistribution(){
        this.starCount = new int[6];
        this.countAccepted = 0.0;
        this.grade = 0;
    }

    public void enterGradeValues(Scanner scanner) {
        int scores = scanner.nextInt();
        double gradeCountTotal = 0;

        while (scores != -1) {

            if ((scores >= 0) && (scores <= 60)) {
                this.grade = distributeGrades(scores);
                tallyStarCount(this.grade);
            }

            gradeCountTotal++;
            scores = scanner.nextInt();
        }

        printStars();
        getAverage(countAccepted, gradeCountTotal);

    }

    private int distributeGrades(int score) {
        int points = score;

        if (points <= 29) {
            grade = 0;
        } else if (points >= 30 && points <= 34) {
            grade = 1;
            countAccepted++;
        } else if (points >= 35 && points <= 39) {
            grade = 2;
            countAccepted++;
        } else if (points >= 40 && points <= 44) {
            grade = 3;
            countAccepted++;
        } else if (points >= 45 && points <= 49) {
            grade = 4;
            countAccepted++;
        } else {
            grade = 5;
            countAccepted++;
        }
        return grade;
    }

    /*
      All grades besides zero are accepted.
    Accepted percentage is calculated with the formula  100 * accepted/gradeCountTotal
     */
    private void getAverage(double accepted, double gradeCountTotal) {

        System.out.println("Acceptance percentage: " + 100 * accepted / gradeCountTotal);

    }

    /*
      keeps a running total of the number of times
      a score falls into a specific grade.
     */
    private void tallyStarCount(int grade) {

        if (grade == 5) {
            starCount[5] += 1;
        } else if (grade == 4) {
            starCount[4] += 1;
        } else if (grade == 3) {
            starCount[3] += 1;
        } else if (grade == 2) {
            starCount[2] += 1;
        } else if (grade == 1) {
            starCount[1] += 1;
        } else if (grade == 0) {
            starCount[0] += 1;
        }

    }

    // Prints the Grade Distribution
    // number of grades are printed as stars.

    private void printStars() {
        System.out.println("Grade distribution:");
        for (int x = starCount.length - 1; x >= 0; x--) {
            System.out.print(x + ": ");

            for (int y = 0; y < starCount[x]; y++) {
                System.out.print("*");
            }

            System.out.println("");
        }
    }

}