using System;

using System.Collections.Generic;

​

public class stdrecord : IComparable <stdrecord>{

    public double GPA = 0;

    public string name;

    int sbjnum = 0;

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

    public stdrecord(string name){

        this.name = name;

    }

    public void addrecord(string sbj, string grade){

        double G = 0;

        record.Add(sbj,grade);

        if(grade == "A"){

            G = 4;

            sbjnum++;

            GPA = G/sbjnum+GPA*(sbjnum-1)/sbjnum;

        }

        else if(grade == "B"){

            G = 3.3;

            sbjnum++;

            GPA = G/sbjnum+GPA*(sbjnum-1)/sbjnum;

        }

        else if(grade == "C"){

            G = 2.7;

            sbjnum++;

            GPA = G/sbjnum+GPA*(sbjnum-1)/sbjnum;

        }

        else if(grade == "F"){

            G = 0;

            sbjnum++;

            GPA = G/sbjnum+GPA*(sbjnum-1)/sbjnum;

        }

    }

    public int CompareTo(stdrecord B){

        if(GPA > B.GPA) return 1;

        else if(GPA == B.GPA) return 0;

        else return -1;

    }

} 

​

public class Program {

    public static void Main() {

        List<stdrecord> records = new List<stdrecord>();

        records.Add(new stdrecord("John"));

        records[0].addrecord("IERG3080", "B");

        records[0].addrecord("IERG3300","A");

        records.Add(new stdrecord("Mary"));

        records[1].addrecord("IERG3080", "A");

        records[1].addrecord("IERG3300", "A");

        records[1].addrecord("GEEC", "B");

        records.Add(new stdrecord("Joe"));

        records[2].addrecord("IERG3080", "C");

        records[2].addrecord("IERG3300", "B");

        records[2].addrecord("ACAT1001", "C");

        records.Add(new stdrecord("Susie"));

        records[3].addrecord("CSCI2100", "C");

        records[3].addrecord("IERG2051", "F");

        records.Sort();

        records.Reverse();

        foreach(stdrecord r in records){

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

        }

    }

}