using System;

public class Program

{

​

    public static void exo2bis(int n)

    {

        for( int j=1;j<=n;j++)

        {   

            for (int i=1;i<=n; i++)

            {Console.Write("*");

            }

             Console.WriteLine();

        }

    }

    public static void Main()

    {

        exo2bis(4);

    }

}