/**
 * Matt Kretchmar
 * January 30, 2005
 * GPACalculator.java
 * This program prompts the user to enter four letter grades (A,B,C,D,F).
 * It then computes the student's semester GPA.
 */
import java.util.Scanner;

class GPACalculator
{
    public static void main ( String [] args )
    {
        char course1, course2, course3, course4;
        double gpa = 0;
        Scanner keyboard = new Scanner(System.in);
        String s;
        
        System.out.println("Enter course letter grade (A-F) 1: ");
        s = keyboard.next();
        course1 = s.charAt(0);
        
        System.out.println("Enter course letter grade (A-F) 2: ");
        s = keyboard.next();
        course2 = s.charAt(0);
        
        System.out.println("Enter course letter grade (A-F) 2: ");
        s = keyboard.next();
        course3 = s.charAt(0);
        
        System.out.println("Enter course letter grade (A-F) 2: ");
        s = keyboard.next();
        course4 = s.charAt(0);

        switch (course1)
        {
            case 'A' : case 'a' :
                gpa = gpa + 4;
                break;
            case 'B' : case 'b' :
                gpa = gpa + 3;
                break;
            case 'C' : case 'c' :
                gpa = gpa + 2;
                break;
            case 'D' : case 'd' :
                gpa = gpa + 1;
                break;
            case 'F' : case 'f' :
                gpa = gpa + 0;
                break;
            default :
                System.out.println("Error: unrecognizable grade input");
        }
        switch (course2)
        {
            case 'A' : case 'a' :
                gpa = gpa + 4;
                break;
            case 'B' : case 'b' :
                gpa = gpa + 3;
                break;
            case 'C' : case 'c' :
                gpa = gpa + 2;
                break;
            case 'D' : case 'd' :
                gpa = gpa + 1;
                break;
            case 'F' : case 'f' :
                gpa = gpa + 0;
                break;
            default :
                System.out.println("Error: unrecognizable grade input");
        }
        
        if ( course3 == 'A' || course3 == 'a' )
            gpa = gpa + 4;
        else if ( course3 == 'B' || course3 == 'b' )
            gpa = gpa + 3;
        else if ( course3 == 'C' || course3 == 'c' )
            gpa = gpa + 2;
        else if ( course3 == 'D' || course3 == 'd' )
            gpa = gpa + 1;
        else if ( course3 == 'F' || course3 == 'f' )
            gpa = gpa + 0;
        else
            System.out.println("Error: unrecognizable grade input");

        if ( course4 == 'A' || course4 == 'a' )
            gpa = gpa + 4;
        else if ( course4 == 'B' || course4 == 'b' )
            gpa = gpa + 3;
        else if ( course4 == 'C' || course4 == 'c' )
            gpa = gpa + 2;
        else if ( course4 == 'D' || course4 == 'd' )
            gpa = gpa + 1;
        else if ( course4 == 'F' || course4 == 'f' )
            gpa = gpa + 0;
        else
            System.out.println("Error: unrecognizable grade input");
        
        gpa = gpa / 4.0;
        System.out.println("GPA = " + gpa );
        if ( gpa < 2.0 )
            System.out.println("academic probation");
        else if ( gpa > 3.5 )
            System.out.println("dean's list");
        else
            System.out.println("good academic standing");
    }
}