using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Début du script");

        var list = new List<string>

        {

            "abc", "g", "garage", "abeille", "gorille", "alice", "houx", "hache", "hey", "gargouillis"

        };

​

// Moyenne du nombre de caractères selon la première lettre de chaques mots :

​

        var firstLetterAndLenght =

            from mot in list

            select new

        {

            firstLetter = mot.Substring(0,1),

            lenght = mot.Length,

        };

​

        /*

        foreach (var i in firstLetterAndLenght)

        {

            Console.WriteLine("{0}:{1}", i.firstLetter, i.lenght);

        }*/

​

        var moyenne =

            (from num in firstLetterAndLenght

            group num by num.firstLetter into playerGroup

            select new

            {

                firstLetter = playerGroup.Key,

                moyNbDeCaractere = playerGroup.Average(x => x.lenght),

            }).OrderByDescending(i => i.moyNbDeCaractere);

​

        Console.WriteLine("La moyenne du nb de caractère selon la première lettre :");

        Console.WriteLine();

        foreach (var num in moyenne)

        {

            Console.Write("{0}:{1}, ", num.firstLetter, num.moyNbDeCaractere);

        }

​

// Nombre d'occurrences de chaque lettre :

        string listBecomeString = "";

        foreach (string num in list) 

        {

            listBecomeString += num;

        }

        Console.WriteLine();

        Console.WriteLine();

​

//      List<char> datalist = new List<char>(listBecomeString);

​

        var nbLettre =

            (from num in listBecomeString

            group num by num into playerGroup

        select new

        {

            letter = playerGroup.Key,

            numberLetter = playerGroup.Count(),

        }).OrderByDescending(i => i.numberLetter);

​

        Console.WriteLine("Nombre d'occurences de chaque lettre dans la liste 'list' : ");

        Console.WriteLine();

        foreach (var num in nbLettre)

        {

            Console.Write("{0}:{1}, ", num.letter, num.numberLetter);

        }

    }

}