Programme en c# qui afficher le triangle suivant :
1
232
34543
4567654
567898765
67890109876
7890123210987
890123454321098
90123456765432109
0123456789876543210

int i, j, n, s;
            s = 0; n = 9;
        for (i = 0;i<= n;i++)
            {
            for (j = 0;j<=  2 * i;j++)
                {
                if (j <= i)
                    {
                        s += 1;
                        if (s == 10) s = 0;
                    Console.Write(s);
                    }
                    else
                    {
                    s -= 1;
                    Console.Write(s);
                    if (s == 0)  s = 10;
                    }
                }
            Console.WriteLine();
            }