mithilesh kumar singh

Enter an input number: 5

               1
         2 3 4
      5 6 7 8 9
   8 7 6 5 4 3 2
1 2 3 4 5 6 7 8 9

class Program 

    {

         static void Main(string[] args) 

        {

            int temp = 1;

            bool flag = true;

            Console.WriteLine("Enter the number"); 

            int n = int.Parse(Console.ReadLine()); 

            for (int row = 0; row <= n; row++) 

            { 

                for (int space = row; space < n; space++) 

                { 

                    Console.Write(" "); 

                }

                for (int coll = 1; coll <= row * 2 - 1; coll++) 

                { 

                    if (temp == 1) 

                        flag = true; 

                    else if (temp == n * 2 - 1)

                        flag = false;

                    Console.Write(temp);

                    if (flag == true)

                        temp++;

                    else if (flag == false)

                        temp--;

                }

                Console.WriteLine();

            }

            Console.ReadLine();

        } 

    }