import java.util.Scanner;

/*
  Author:  James Tam
  Version: January 8, 2020 (minor modifications to an earlier version)
  Learning objective: Implementing a switch structure (at most only 
  one case can be true).

*/

public class SwitchExample
{
    public static void main(String [] args)
    {
        final int FIRST = 0;
        String line;
        char letter;
        int gpa;
        Scanner in = new Scanner(System.in);


        System.out.print("Enter letter grade: ");
        line = in.nextLine();
        letter = line.charAt(FIRST);
        switch (letter)
        {
           case 'A':
           case 'a':
              gpa = 4;
              break;

           case 'B':
           case 'b':
              gpa = 3;
              break;

           case 'C':
           case 'c':
              gpa = 2;
              break;

           case 'D':
           case 'd':
              gpa = 1;
              break;

           case 'F':
           case 'f':
              gpa = 0;
              break;

           default:
              gpa = -1;

        }
        System.out.println("Letter grade: " + letter);
        System.out.println("Grade point: " + gpa);
    }
}