using System;
public class Program
{
public static void Main()
int carre=0;
bool fin = false;
while(!fin)
Console.WriteLine("Ecrire un nombre");
string mot= Console.ReadLine();
if (mot=="fin")
Console.WriteLine("fin de programme");
fin=true;
}
else
int x =Convert.ToInt32(Console.ReadLine());
carre= x*x;
Console.WriteLine("le carré est "+carre);