/*
	GPA program, Spring 2012
	600.107
*/

   import java.util.Scanner;

   public class gpa {
   
      public static void main(String[] args) {
      // variable declarations
         Scanner keyboard = new Scanner(System.in);
         int numCourses, courseNum;
         String grade;  // letter grade for one course
         double credits; // credits for one course
         double points; // point value for grade for one course
         double totalCredits=0; // for all courses
         double totalPoints=0; // sum points*credits for all courses
			double gpa;
            
         System.out.print("How many courses? ");
         numCourses = keyboard.nextInt();
         System.out.println("Please enter letter grades and credits (A- 3.5)");
         courseNum = 1;
         while (courseNum <= numCourses) {
            System.out.print(courseNum + ") ");
            courseNum = courseNum + 1;
            grade = keyboard.next().toUpperCase();  // stops at first space
/* NOT THE SAME:
				grade = keyboard.next();
				grade.toUpperCase();  // not reassigned to grade variable
*/

            credits = keyboard.nextDouble();
            totalCredits = totalCredits + credits;
            points = convertGrade(grade); 
            totalPoints = totalPoints + points*credits;
         }
      //	System.out.println("totalCredits: " + totalCredits);
      // System.out.println("GPA is " + totalPoints / totalCredits);
			gpa = totalPoints / totalCredits;
			System.out.printf("GPA is %.3f", gpa);
			System.out.println();   // go to next line
			if (gpa >= 3.5)
				System.out.println("Woohoo - Dean's list!");
			else if (gpa < 2.0)
				System.out.println("uh-oh, Ac Pro... ");
      
      }
   
      public static double convertGrade(String grade) {
         double pnts;
         char letter = grade.charAt(0);
         if (letter == 'A') pnts = 4;
         else if (letter == 'B') pnts = 3;
         else if (letter == 'C') pnts = 2;
         else if (letter == 'D') pnts = 1;
         else pnts = 0;
         if (grade.length() > 1) {
         //if there's a + and not A, add .3
            if (grade.charAt(1) == '+' && letter != 'A')
               pnts = pnts + .3;
            //if there's a - and not D, subtract .3
            else if (grade.charAt(1) == '-' && letter != 'D')
               pnts = pnts - .3;
         }
         return pnts;
      }
   
   }