Project: Class Results

Lab Java Advanced 30 points

Read n students. Each line has a name followed by exactly three marks. For each student, work out the average (1 decimal) and a grade (A: 90+, B: 75+, C: 50+, F: below 50). Print the students sorted by average from highest to lowest (ties: alphabetical by name) as <name> <average> <grade>. Then print Class average: <avg of all averages, 1 decimal>.

Input

First n, then n lines: name m1 m2 m3.

Output

As described above.

Example

Input

3
Asha 95 88 92
Ravi 70 65 80
Meera 45 52 38

Output

Asha 91.7 A
Ravi 71.7 C
Meera 45.0 F
Class average: 69.4

Sample input available Sample output available

Editor

Java

Hints

Divide the sum by 3.0 to keep the decimals.

Double.compare(b.avg, a.avg) sorts high to low.

printf("%s %.1f %c%n", ...) prints a String, a 1-decimal number and a char.

Solution explanation

A small class holds each result, a comparator sorts them, and a stream works out the class average.

Show solution

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

class Result {
    String name;
    double avg;

    Result(String name, double avg) {
        this.name = name;
        this.avg = avg;
    }

    char grade() {
        if (avg >= 90) return 'A';
        if (avg >= 75) return 'B';
        if (avg >= 50) return 'C';
        return 'F';
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        List<Result> list = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            String name = sc.next();
            int sum = sc.nextInt() + sc.nextInt() + sc.nextInt();
            list.add(new Result(name, sum / 3.0));
        }
        list.sort((a, b) -> a.avg != b.avg ? Double.compare(b.avg, a.avg) : a.name.compareTo(b.name));
        for (Result r : list) {
            System.out.printf("%s %.1f %c%n", r.name, r.avg, r.grade());
        }
        double classAvg = list.stream().mapToDouble(r -> r.avg).average().getAsDouble();
        System.out.printf("Class average: %.1f%n", classAvg);
    }
}

Output

Answer