/*Author:
*Course:
*File Name: LabFive
*Due Date: Tues, Nov. 23th

Purpose: The purpose of this program is to ask the user to enter the
final exam scores until a sentinel value (-1) is entered. Display the
total number of scores in A, B, C, D, F using a standard grading scale,
followed by the % of each letter grade (formated to 1 decimal place).
Display the average fo all scores (formatted to 2 decimal places).
*/

import java.util.Scanner;

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

     //declaring variables
     double sum = 0; //keeps running total of scores
     int countA = 0; //keeps count how many A's
     int countB = 0; //keeps count how many B's
     int countC = 0; //keeps count how many C's
     int countD = 0; //keeps count how many D's
     int countF = 0; //keeps count how many F's
  double score; //stores scores entered



         //ask for first test score
         System.out.print("Please enter score (-1 to end): ");
         score = in.nextDouble(); //stores the first score to enter the loop

         while (score != -1) // end input when -1
         {
             score = GetScore(score);

             sum += score; // accumulator to sum all scores

             if (score >= 90)
             {countA++; //increases the A grade count
             }//end A Counter
             else if (score >= 80)
             {countB++; //increases the B grade count
             }//end B Counter
             else if (score >= 70)
             {countC++; //increases the C grade count
             }//end C Counter
             else if (score >= 60)
             {countD++; //increases the D grade count
             }//end D Counter
             else
             {countF++; //increases the F grade count
             }//end F Counter

             // read in the next score
             System.out.print("Please enter score (-1 to end): ");
             score = in.nextDouble();
         } // end while



         GetResults(sum, countA, countB, countC, countD, countF);


     } //end main

     public static double GetScore(double score)
     {  Scanner in = new Scanner (System.in);
             // validate test score
          while (score < -1 || score > 100)
             {
                System.out.println("\tInvalid enter 0-100 only (-1 to end)");
                System.out.print("\tPlease enter score (-1 to end): ");
                score = in.nextDouble();
             } // end while data validation
          return score;
     }

     public static void GetResults(double sum, int countA, int countB, int countC, int countD, int countF)
      { Scanner in = new Scanner (System.in);

     //total amount of tests
         int countTest = (countA + countB + countC + countD + countF);

         System.out.print("\nTotal number of Scores: " + countTest);
         System.out.print("\n\t\tTotal number of A's: " + countA);
         System.out.print("\n\t\tTotal number of B's: " + countB);
         System.out.print("\n\t\tTotal number of C's: " + countC);
         System.out.print("\n\t\tTotal number of D's: " + countD);
         System.out.print("\n\t\tTotal number of F's: " + countF);

         // Percentages of each grade
         double avgA = (double)countA / countTest * 100;
         double avgB = (double)countB / countTest * 100;
         double avgC = (double)countC / countTest * 100;
         double avgD = (double)countD / countTest * 100;
         double avgF = (double)countF / countTest * 100;

         System.out.println("\n\nIndividual grade percentages...");
         System.out.printf("\t\tA: %.1f" , avgA);
         System.out.print("%");
         System.out.printf("\n\t\tB: %.1f" , avgB);
         System.out.print("%");
         System.out.printf("\n\t\tC: %.1f" , avgC);
         System.out.print("%");
         System.out.printf("\n\t\tD: %.1f" , avgD);
         System.out.print("%");
         System.out.printf("\n\t\tF: %.1f" , avgF);
         System.out.println("%");

         double avgScore = sum / countTest; //calculate average grade

         System.out.printf("\nAverage score = %.2f" , avgScore);
         System.out.println("%\n");
    }
 } // end of the class