//A program in Java to calculate GPA
//version 1
//Barimani's Programming I class, Fall 2011

class GpaAPP
{

  public static double QP(String LG) 
  {
	double GradeWeight=0;
	if (LG.equals ("A") || LG.equals("a"))
		GradeWeight = 4.0;
	else
	if (LG.equals ("B") || LG.equals("b"))
		GradeWeight = 3.0;
	else
	if (LG.equals ("C") || LG.equals("c"))
		GradeWeight = 2.0;
	else
	if (LG.equals ("D") || LG.equals("d"))
		GradeWeight = 1.0;
	return GradeWeight;
  }

  public static void main(String args[])
  {
	int numberOfclasses, credits, TotCredits=0;
	String Grade;
	double numerator=0, GPA;
	System.out.println("# of classes? ");
	numberOfclasses= Integer.parseInt(Instream.getline());
	for (int i=1; i<=numberOfclasses; i++)
	{
		System.out.println("Class # "+ i+ " Letter Grade (A, B, C, D, or F)? ");
		Grade= Instream.getline();	
		System.out.println("Class # " + i +" Credits? ");		
		credits= Integer.parseInt(Instream.getline());
		TotCredits = TotCredits + credits;
		numerator = numerator + credits * QP(Grade);
		System.out.println("----------\n");
	}
	GPA = numerator / TotCredits;
	System.out.println("GPA= " + GPA);
 }

}