using System;

using System.Collections.Generic;

​

public class StudentRecord : IComparable<StudentRecord>{

    private string name;

    private Dictionary<string, string> dict;

    private double gpa;

    public string Name{

        get{return name;}

    }

    public double GPA{

        get{return gpa;}

    }

    public StudentRecord(string pname){

        name = pname;

        dict = new Dictionary<string, string>();

    }   

    public void AddCourseResult(string Course, string Result){

        dict.Add(Course,Result);

        gpa = CalculateGPA();

    }

    public double CalculateGPA(){

        int count = 0;

        gpa = 0;

        Dictionary<string, string>.ValueCollection values = dict.Values;

        foreach (string g in values){

            if (g == "A"){

                gpa = gpa + 4;

            }

            if (g == "B"){

                gpa = gpa + 3.3;

            }

            if (g == "C"){

                gpa = gpa + 2.7;

            }

            count = count + 1;

        }

        gpa = gpa/count;

        return gpa;

    }

    public void ShowDict(){

        Console.WriteLine(name);

        foreach(KeyValuePair<string, string> pair in dict){

         Console.WriteLine("Course = {0}, Grade = {1}", pair.Key, pair.Value);

        }

    }

    public int CompareTo(StudentRecord s){

        if (gpa > s.gpa) return -1;

        else if (gpa == s.gpa) return 0;

        else return 1;

    }

}

public class Program

{

    public static void Main()

    {

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

        StudentRecord s1 = new StudentRecord("John");

        StudentRecord s2 = new StudentRecord("Mary");

        StudentRecord s3 = new StudentRecord("Joe");

        StudentRecord s4 = new StudentRecord("Susie");

        SR.Add(s1);

        SR.Add(s2);

        SR.Add(s3);

        SR.Add(s4);

        s1.AddCourseResult("IERG3080","B");

        s1.AddCourseResult("IERG3300","A");

        s2.AddCourseResult("IERG3080","A");

        s2.AddCourseResult("IERG3300","A");

        s2.AddCourseResult("GEEC1000","B");

        s3.AddCourseResult("IERG3080","C");

        s3.AddCourseResult("IERG3300","B");

        s3.AddCourseResult("ACAT1001","C");

        s4.AddCourseResult("CSCI2100","C");

        s4.AddCourseResult("IERG2051","F");

        s1.ShowDict();

        Console.WriteLine("GPA = {0}",s1.GPA);

        s2.ShowDict();

        Console.WriteLine("GPA = {0}",s2.GPA);

        s3.ShowDict();

        Console.WriteLine("GPA = {0}",s3.GPA);

        s4.ShowDict();

        Console.WriteLine("GPA = {0}",s4.GPA);

        SR.Sort();

        foreach (StudentRecord x in SR){

            Console.Write("{0} ",x.Name);

        }

    }

}