import java.util.Scanner;

public class GpaTestEx1
{
   public static void main(String[] args)
   {
      final int NUM_COURSES = 4;

      Scanner scan = new Scanner(System.in);

      int[] credits;
      credits = new int[NUM_COURSES];
      char[] grades;
      grades = new char[NUM_COURSES];

      int creditSum = 0;
      int totalPts = 0;

      for(int i = 0; i < NUM_COURSES; i++)
      {
         System.out.print("Enter credits for course "+(i+1)+": ");
         int credit = scan.nextInt();
         credits[i] = credit;

         System.out.print("Enter grade for course " + (i+1) + ": ");
         char grade = scan.next().charAt(0);
         grades[i] = grade;

         switch(grade)
         {
            case 'A':
            case 'a': grade = 4;
            break;

            case 'B':
            case 'b': grade = 3;
            break;

            case 'C':
            case 'c': grade = 2;
            break;

            case 'D':
            case 'd': grade = 1;
            break;

            case 'F':
            case 'f': grade = 0;
            break;
         }



         creditSum = creditSum + credit;
         totalPts = totalPts + (credit*grade);


      }

      System.out.printf("\nTotal number of credits: " + creditSum);
      System.out.printf("\nTotal number of points: " + totalPts);

      double gpa = 0;
      gpa = (double)totalPts/creditSum;

      if(gpa > 0)
      {
         System.out.printf("\nGPA: %5.2f", gpa);
      }
      else
      {
         System.out.printf("\nGPA: 0.00");
      }

   }
}