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

public class FileGrades{

public static final int NAssignments = 7;
public static final int NLabs = 10;
public static final int NMidterms = 2;
public static final int NFinal = 1;
public static final double WAssignments = 3.0;
public static final double WLabs = 0.5;
public static final double WMidterms = 16.0;
public static final double WFinal = 42.0;

public static void main (String[] args){
  Scanner userInput =  new Scanner(System.in);

  File file = new File("grades.dat");
    Scanner fileInput;
  try {
        fileInput = new Scanner(file);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return;
    }

    System.out.println("Course grade calculator");
    System.out.println("calculates the weighted grade for a student");
    System.out.println("Inputs: Assignment, Lab and Exam grades");

    System.out.print("Passing grade for final ==> ");
    double passingG = userInput.nextDouble();

    int numAplus = 0;
    int numA = 0;
    int numAminus = 0;
    int numBplus = 0;
    int numB = 0;
    int numBminus = 0;
    int numCplus = 0;
    int numC = 0;
    int numD = 0;
    int numF = 0;
    //double grade = gradeProcessing();
    while (fileInput.hasNextLine())
    {
      double grade = gradeProcessing(fileInput, passingG);
      if(grade < passingG) {
    System.out.println("Grade: 49.0 F");
    numF++;
   }
    else{

     if(grade >= 90) {
      System.out.printf("Grade: %.2f A+\n", grade);
      numAplus++;
     }
     else if (grade >= 85) {
      System.out.printf("Grade: %.2f A\n", grade);
      numA++;
     }
     else if (grade >= 80) {
      System.out.printf("Grade: %.2f A-\n", grade);
      numAminus++;
     }
     else if (grade >= 77) {
      System.out.printf("Grade: %.2f B+\n", grade);
      numBplus++;
     }
     else if (grade >= 73) {
      System.out.printf("Grade: %.2f B\n", grade);
      numB++;
     }
     else if (grade >= 70) {
      System.out.printf("Grade: %.2f B-\n", grade);
      numBminus++;
     }
     else if (grade >= 65) {
      System.out.printf("Grade: %.2f C+\n", grade);
      numCplus++;
     }
     else if (grade >= 60) {
      System.out.printf("Grade: %.2f C\n", grade);
      numC++;
     }
     else if (grade >= 50) {
      System.out.printf("Grade: %.2f D\n", grade);
      numD++;
     }
     else {
      System.out.println("Grade: "+ grade +" F");
     }
    }
}
}
public static double gradeProcessing(Scanner inFile, double passingG){
  int studentID;
  double grade;
  double finalExam;
  studentID = inFile.nextInt();
  grade = average("Assignment ", NLabs, NAssignments, WAssignments, inFile);
  grade += average("Lab ", 1, NLabs, WLabs, inFile);
  grade += average("Midterm ", 100,  NMidterms, WMidterms, inFile);
  finalExam = average ("Final Exam ", 100, NFinal, WFinal, inFile);
  System.out.print("grade = " + grade);
  if (finalExam < passingG / 100.0 * WFinal){
    if ((grade + finalExam) < 49.5){
      grade = 49;
    }
    else grade += finalExam;
  }else grade+= finalExam;

  return grade;
}

public static double average(String activity, int max, int num, double weight, Scanner input){
  double grade;
  double sum = 0.0;
  for (int i = 0; i < num; i++){
      grade = input.nextDouble();
      sum = sum + grade / max;
  }
  return sum * weight;
}

public static String letter(double grade){
  String letter;

  if (grade < 49.5) letter = "F";
        else if (grade < 59.5) letter = "D";
        else if (grade < 64.5) letter = "C";
        else if (grade < 69.5) letter = "C+";
        else if (grade < 72.5) letter = "B-";
        else if (grade < 76.5) letter = "B";
        else if (grade < 79.5) letter = "B+";
        else if (grade < 84.5) letter = "A-";
        else if (grade < 89.5) letter = "A";
        else letter = "A+";

    return letter;
}
}