using System;

public class Program

{

    public enum StudentType

    {

        Standard = 0,

        Honors = 1,

        DualEnrolled = 2

    }

    public static void Main()

    {

        Console.WriteLine(GetGPA('A', StudentType.DualEnrolled, true));

        Console.WriteLine(GetGPA('A', StudentType.DualEnrolled, false));

    }

     public static double GetGPA(char letterGrade, StudentType studentType, bool isWeighted)

        {

            var weight = (isWeighted && (studentType & (StudentType.Honors | StudentType.DualEnrolled)) > 0) ? 1 : 0;

​

            switch (letterGrade)

            {

                case 'A':

                    return weight + 4;

                case 'B':

                    return weight + 3;

                case 'C':

                    return weight + 2;

                case 'D':

                    return weight + 1;

                case 'F':

                    return 0;

            }

            return 0;

        }

}