zad4

import java.io.*;
import java.util.ArrayList;

public class HW01_4 {
    public static void main(String[] args) throws IOException {
        File file = new File("rezultati.csv");
        FileReader fis = new FileReader(file);
        BufferedReader br = new BufferedReader(fis);
        String line;
        ArrayList<Student> students = new ArrayList<>();

        String info = br.readLine();

        try {
            while ((line = br.readLine()) != null) {
                students.add(new Student(line));
            }
        }catch (Exception e){
            throw e;
        }

        for (Student student: students) {
            System.out.printf("%.2f\n", student.getAverage());
        }

        System.out.println();
        String [] parts = info.split(",");
        for(int i = 1; i < parts.length; i++){
            StringBuilder sb = new StringBuilder(parts[i] + ": ");
            double avg = 0;
            for (Student s : students) {
                avg += s.grades.get(i - 1);
            }
            sb.append(String.format("%.2f", avg / (students.size())));
//            sb.append("\n");
            System.out.println(sb.toString());
        }
    }
}

class Student{
    int index;
    ArrayList<Integer> grades;

    public Student(String str) {
        String [] parts = str.split(",");
        this.index = Integer.parseInt(parts[0]);
//        System.out.println(index);
//        int temp;
        this.grades = new ArrayList<>();
        for (int i = 1; i < parts.length; i++) {
//            temp = Integer.parseInt(parts[i]);
            grades.add(Integer.parseInt(parts[i]));
//            grades.add(temp);
        }
    }

    public double getAverage(){
        double sum = 0;
        for (int grade : grades) {
            sum += grade;
        }
        return sum / grades.size();
    }
}