import java.util.Scanner;
public class Grades
{
	public static void main(String[] args)
	{
   private double quiz1;
   private double quiz2;
   private double midtermExam;
   private double finalExam;
   private double totalScore;
   private char letterGrade;
   private String firstName;
   private String middleName;
   private String lastName;
   private Scanner input;

   public Grades()
   {
       quiz1 = 0;
       quiz2 = 0;
       midtermExam = 0;
       finalExam = 0;
       input = new Scanner(System.in);
   }

   public void readInput()
   {
       System.out.println();
       System.out.print("Enter the first name of a student: ");
       firstName = input.next();

       System.out.print("Enter the middle name of a student: ");
       middleName = input.next();

       System.out.print("Enter the last name of a student: ");
       lastName = input.next();

       System.out.print("Enter a score out of 10 for quiz2: ");
       quiz1 = input.nextDouble();

       while(quiz1 < 0 || quiz1 > 10)
       {
           System.out.print("Enter a valid score out of 10 for quiz1: ");
           quiz1 = input.nextDouble();
       }

       System.out.print("Enter a score out of 10 for quiz2: ");
       quiz2 = input.nextDouble();

       while(quiz2 < 0 || quiz2 > 10)
       {
           System.out.print("Enter a valid score out of 10 for quiz2: ");
           quiz2 = input.nextDouble();
       }

       System.out.print("Enter a score out of 100 for midterm exam: ");
       midtermExam = input.nextDouble();

       while(midtermExam < 0 || midtermExam > 100)
       {
           System.out.print("Enter a valid score out of 100 for midterm exam: ");
           midtermExam = input.nextDouble();
       }

       System.out.print("Enter a score out of 100 for final exam: ");
       finalExam = input.nextDouble();

       while(finalExam < 0 || finalExam > 100)
       {
           System.out.print("Enter a valid score out of 100 for final exam: ");
           finalExam = input.nextDouble();
       }
   }

   public void calculateGrade()
   {
       double quizGrade = ((quiz1 + quiz2) / 20 * 100) * 0.25;
       double midtermGrade = midtermExam * 0.25;
       double finalGrade = finalExam * 0.50;

       totalScore = quizGrade + midtermGrade + finalGrade;

       totalScore = Math.round(totalScore * 100.0) / 100.0;

       if(totalScore >= 90)
           letterGrade = 'A';
       else if(totalScore >= 80)
           letterGrade = 'B';
       else if(totalScore >= 70)
           letterGrade = 'C';
       else if(totalScore >= 60)
           letterGrade = 'D';
       else
           letterGrade = 'F';
   }

   public void writeOutput()
   {
       System.out.println();
       System.out.println("Student " + firstName + " " + middleName + " " + lastName);
       System.out.println("had these scores");
       System.out.println("\tFirst quiz " + quiz1);
       System.out.println("\tSecond quiz " + quiz2);
       System.out.println("\tMidterm exam " + midtermExam);
       System.out.println("\tFinal exam " + finalExam);
       System.out.println("the total score is " + totalScore);
       System.out.println("the letter grade is \"" + letterGrade + "\"");
       System.out.println();
   }
}