using System;

using System.Collections.Generic;

​

​

public class Program

{

    public class StudentRecord : IComparable<StudentRecord>

    {

        Dictionary<string, char> course;

        double GPA = 0.0;

        public string name;

        public StudentRecord(string name)

        {

            this.name = name;

            course = new Dictionary<string, Char>();

        }

        public void AddCourse(string coursename, char Grade)

        {

            course.Add(coursename, Grade);

            //Console.WriteLine("course : {0} Grade: {1}", coursename, Grade);

        }

        private double CalculateGPA()

        {

            double score = 0;   

            int count = 0;

            foreach(KeyValuePair<string, Char> x in course)

            {

                if (x.Value == 'A')

                    score = score + 4.0;

                else if(x.Value == 'B')

                    score = score + 3.3;

                else if(x.Value == 'C')

                    score = score + 2.7;

                    count++;

            }

            GPA = score / (double) count;

            return GPA;

        }

        public int CompareTo(StudentRecord other)

        {

            double GPAMe = CalculateGPA();

            double GPAOther = other.CalculateGPA();

            if (GPAMe > GPAOther)

                return -1;

            else if(GPAMe < GPAOther)

                return 1;

            else return 0;

        }

    }   

​

    public static void Main()

    {

        List<StudentRecord> studentrecord = new List<StudentRecord>();

        StudentRecord John = new StudentRecord("John");

        John.AddCourse("IERG3080", 'B');

        John.AddCourse("IERG3300", 'A');

        StudentRecord Mary = new StudentRecord("Mary");

        Mary.AddCourse("IERG3080", 'A');

        Mary.AddCourse("IERG3300", 'A');

        Mary.AddCourse("GEEC1000", 'B');

        StudentRecord Joe = new StudentRecord("Joe");

        Joe.AddCourse("IERG3080", 'C');

        Joe.AddCourse("IERG3300", 'B');

        Joe.AddCourse("ACAT1001", 'C');

        StudentRecord Susie = new StudentRecord("Susie");

        Susie.AddCourse("CSCI2100", 'C');

        Susie.AddCourse("IERG2051", 'F');

        studentrecord.Add(John);

        studentrecord.Add(Mary);

        studentrecord.Add(Joe);

        studentrecord.Add(Susie);

        studentrecord.Sort();

        foreach(StudentRecord student in studentrecord)

        {

            Console.WriteLine(student.name);

        }   

    }

}