public static void Main()
Console.WriteLine("Carlos Ivan Lopez Aldava");
Console.Write("Calculate the sum of the series 1 +11 + 111 + 1111 + .. n terms:\n");
Console.Write("------------------------------------------------------------------");
Console.Write("Input the numbe of terms : ");
n= Convert.ToInt32(Console.ReadLine());
Console.Write("{0} + ",t);
Console.Write("\nThe Sum is : {0}\n",sum);