/*
CSE 142, Autumn 2009, Marty Stepp

This program reads a file representing which students attended which
discussion sections and produces output of their scores and grades.

Each line of the file has 45 characters split into nine 5-letter sections.
An 'a' means the student was absent, an 'n' means they attended but
didn't do the section problems, and a 'y' means they did the problems.

The purpose of the program is to demonstrate using an array for tallying,
and to demonstrate text processing with the char data type.


Example input:
yynyyynayayynyyyayanyyyaynayyayyanayyyanyayna
ayyanyyyyayanaayyanayyyananayayaynyayayynynya
yyayaynyyayyanynnyyyayyanayaynannnyyayyayayny


Example output:
Section 1
Student points: [20, 17, 19, 16, 13]
Student grades: [100.0, 85.0, 95.0, 80.0, 65.0]

Section 2
Student points: [17, 20, 16, 16, 10]
Student grades: [85.0, 100.0, 80.0, 80.0, 50.0]

Section 3
Student points: [17, 18, 17, 20, 16]
Student grades: [85.0, 90.0, 85.0, 100.0, 80.0]
*/

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

public class Sections {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner input = new Scanner(new File("sections.txt"));
        int section = 1;
        while (input.hasNextLine()) {
            // Look at the pattern of character indexes to student index.
            // It wraps around every 5 characters...
            //
            // student 01234012340123401234...
            // index   01234567890123456789...
            // line = "yynyyynayayynyyyayanyyyaynayyayyanayyyanyayna"
            
            String line = input.nextLine();      // process one section
            
            // step 1: compute each student's points earned
            int[] points = new int[5];
            for (int i = 0; i < line.length(); i++) {
                int index = i % 5;   // see comments above
                int earned = 0;
                if (line.charAt(i) == 'y') {     // c == 'y' or 'n' or 'a'
                    earned = 3;
                } else if (line.charAt(i) == 'n') {
                    earned = 2;
                }
                
                // cap the points at 20 for each student
                points[index] = Math.min(20, points[index] + earned);
            }

            // step 2: compute each student's grade percentage
            double[] grades = new double[5];
            for (int i = 0; i < points.length; i++) {
                grades[i] = 100.0 * points[i] / 20.0;
            }

            // step 3: output the results
            System.out.println("Section " + section);
            System.out.println("Student points: " + Arrays.toString(points));
            System.out.println("Student grades: " + Arrays.toString(grades));
            System.out.println();
            section++;
        }
    }
}