06/15日のC#勉強会で出した課題の解答例（LINQ版）

example.cs

using System;
using System.Linq;
using CampusSquare;


class Example2 {
	public static void Main() {
		var grades = new CampusSquare.DummyCampusSquare("record.html").GetGrades();

		Console.WriteLine("GPA: " + (
			(double)grades.Select(x => x.GradeNum * x.CreditNum).Sum()
			/
			grades.Select(x => x.CreditNum).Sum()
		));

		Console.WriteLine("\ngood: ");
		foreach(var grade in grades.Where(x => x.GradeNum == grades.Select(y => y.GradeNum).Max())){
			Console.WriteLine(" " + grade.Grade + ": " + grade.Name);
		}

		Console.WriteLine("\nbad: ");
		foreach(var grade in grades.Where(x => x.GradeNum == grades.Select(y => y.GradeNum).Min())){
			Console.WriteLine(" " + grade.Grade + ": " + grade.Name);
		}
	}
}