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

public class Program_14_3 {
   public static void main(String [] args) throws Exception {
      Scanner keyboard = new Scanner(System.in);    
      
      System.out.print("roster file? ");
      String filename = keyboard.next();
      
      final int CAPACITY = 100;
      
      String [] 
         lastNames = new String[CAPACITY],
         firstNames = new String[CAPACITY];
      
      int [] 
         midterms = new int[CAPACITY],
         finals = new int[CAPACITY];
      
      double [] averages = new double[CAPACITY];
      
      char [] grades = new char[CAPACITY];
      
      int size = read(filename, lastNames, firstNames, midterms, finals, CAPACITY);
      
      calculateAverages(midterms, finals, averages, size);
      
      double classAverage = calculateClassAverage(averages, size);
      
      calculateGrades(averages, grades, size);
      
      printRoster(lastNames, firstNames, averages, grades, classAverage, size);
   }
   
   public static int read(String filename, String [] lastNames, String [] firstNames,
                          int [] midterms, int [] finals, int capacity) throws Exception {
      Scanner scanner = new Scanner(new File(filename));
      
      int size = 0;
      
      while (scanner.hasNext()) {
         if (size >= capacity) {
            System.out.print("Reached array capacity and still more data. Make the array bigger");
            System.exit(1);
         }
         lastNames[size] = scanner.next();
         firstNames[size] = scanner.next();
         midterms[size] = scanner.nextInt();
         finals[size] = scanner.nextInt();
         size++;
      }
      return size;
   }
      
   public static void calculateAverages(int [] midterms, int [] finals, double [] averages, int size) {
      for (int i = 0; i < size; i++)
         averages[i] = calculateOneAverage(midterms[i], finals[i]);
   }
      
   public static double calculateOneAverage(int midterm, int finalExam) {return (midterm + finalExam)/2.0;}
   
   public static double calculateClassAverage(double [] averages, int size) {
      double total = 0;
      for (int i = 0; i < size; i++)
         total += averages[i];
      return total / size;
   }
   
   public static void calculateGrades(double [] averages, char [] grades, int size) {
      for (int i = 0; i < size; i++)
         grades[i] = calculateOneGrade(averages[i]);
   }
   
   public static char calculateOneGrade(double average) {
      return average >= 90 ? 'A' : average >= 80 ? 'B' : average >= 70 ? 'C' : average >= 60 ? 'D' : 'F';
   }
   
   public static void printRoster(String [] lastNames, String [] firstNames, double [] averages, 
                                  char [] grades, double classAverage, int size) {
      for (int i = 0; i < size; i++)
         printOneStudent(lastNames[i], firstNames[i], averages[i], grades[i], classAverage);
   }
   
   public static void printOneStudent(String lastName, String firstName, double average, 
                                      char grade, double classAverage) {
      System.out.println(lastName + " " + firstName + " " + average + " " + grade + " " +
                       (average >= classAverage ? "Above" : "Below"));
  }
}