using System;

public class Program

{

    public static void Main()

    {

        Studente s1=new Studente (0,"Altieri");

        Studente s2=new Studente (1,"Lauri");

        Studente s3=new Studente (2,"Luglio");

        Studente s4=new Studente (3,"Matteis");

        Studente s5=new Studente (4,"Moscatelli");

        Studente s6=new Studente (5,"Peverada");

        Studente s7=new Studente (6,"Scaletti");

        Random rnd = new Random();

        Studente[] s = {s1,s2,s3,s4,s5,s6,s7};

        int dice   = rnd.Next(0, 8);

        for(int i = 0; i<s.Length;i++){

            if(i==dice){

                Console.WriteLine(s[i].cognome);

            }

        }

    }

}

​

public class Studente{

    public int matricola;

    public string cognome;

    public Studente(int m, string c){

        matricola=m;

        cognome=c;

    }

}