public class Gpa
{
   private int[]credits;
   private String[] grades;
   private int numCourses;
   private int maxCourses;

   public Gpa(int noCourses)
   {
      maxCourses = noCourses;
      numCourses = 0;
      credits = new int[maxCourses];
      grades = new String[maxCourses];
   }

   public void addCourse(int newCredits, String newGrade)
   {
      credits[numCourses] = newCredits;
      grades[numCourses] = newGrade;
      numCourses++;
   }

   public double calcGPA()
   {
      int totalPts = 0;
      int creditSum = 0;
      int pts = 0;


      for(int i = 0; i < maxCourses; i++)
      {
         switch(grades[i])
         {
            case "A":
            case "a": pts = 4;
            break;

            case "B":
            case "b": pts = 3;
            break;

            case "C":
            case "c": pts = 2;
            break;

            case "D":
            case "d": pts = 1;
            break;

            case "F":
            case "f": pts = 0;
            break;
         }

         creditSum = creditSum + credits[i];
         totalPts = totalPts + (credits[i]*pts);
      }


      double gpa = (double)totalPts/creditSum;

      if(gpa > 0)
      {
         return gpa;
      }
      else
      {
         return 0.00;
      }
   }
}