import java.util.Scanner;
import java.util.Arrays;
public class scores {

	public static void main(String[] args) {


	 double[] scores = new double[30];
	 double[] credithour = new double[30];
   double total = 0;
   int register;
	 double gpa;

		  String[] course = new String[30];

		   System.out.print(" how many courses did you register ? : ");

		   Scanner input4 = new Scanner(System.in) ;

		             register = input4.nextInt();


		             if (register > 2 && register < 18){

		     	    System.out.println (" You registered "+register+" courses !!!");
		     	   Scanner input = new Scanner(System.in);

		     	    System.out.println("Please enter " + register +  " course names :::"+"\t");

		     	   for (int i = 0; i<register; i++){

		     		   System.out.print (" Enter course " + (i+1) + ":");
		     	        course[i] = input.nextLine();


		     	    }
		     	    System.out.println("Thank you ");

		     	   System.out.println (" Now please enter the scores for each course !!!");



		     	   for (int i = 0; i< register; i++) {

		     			System.out.println (" Enter score for " + course[i] + ":");


		     				 scores[i] = input.nextInt();






		     	    }

		     	  System.out.print (" Now enter their credit values !!!");

		     	   for (int i = 0; i< register; i++) {
		     		  System.out.println (" Enter credit value for " + course[i] + ":");
		     	        credithour[i] = input.nextInt();
//		     	   	System.out.println (" done :");

		     	    }

		     	     input.close();
		     	    input4.close();
		     	   //////
		     	   for(int i=0;i<register;i++){
    				   if ( scores[i] >= 90 ){
                        	System.out.println( " Your grade is A  " );
                        	scores[i]= 4.0;
                        	System.out.println( scores[i] );
    				   }
                        	else
                        	if ( scores[i] >= 80 ){
                        	System.out.println( " Your grade is B  " );
    				        scores[i]= 3.5;}
                        	else
                        	if ( scores[i] >= 70 ){
                        	System.out.println( " Your grade is  C  " );
                            scores[i]= 3.0;}
                        	else
                        	if ( scores[i] >= 60 ){
                        	System.out.println( " Your grade is D  " );
                        	scores[i]= 2.5;}
                        	else{
                        	System.out.println( " Your grade is  F  " );
                        	scores[i]= 2.0;
                        	}
    				   }



		     	   for (int i=0;i<register;i++){

		     		   total +=credithour[i]*scores[i];

		     	       System.out.println (credithour[i]+"hours " + scores[i] + "score");

		     	   }

		     	double cpa = 0;
				for (int i=0;i<register;i++){

		     		   cpa +=credithour[i];

		     	  }

		     	  System.out.println (" You total is : " + total);
		     	    gpa = total /cpa;

		     	   System.out.println (" You GPA for this semester is : " + gpa);
		     	   System.out.println (" Coursname \t Score \t credithour");

		    	   for(int i=0;i<register;i++){

		    		   System.out.println (" " + course[i] + "\t"  +    "       " +scores[i] + "\t" +   "    " + credithour[i]  );


		    	   }