using System;

public class DiamondTriangleProgram

{

    public static void Main()

    {

             Console.WriteLine("Program for displaying pattern of *.");

            Console.Write("Enter the maximum number of *: (Top to Middle line)");

            int n = Convert.ToInt32(Console.ReadLine());

​

          //loop to print first half or equilateral triangle

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

            {

                //for loop to add space

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

                {

                    Console.Write(" ");

                }

                //for loop to print *, for each line 

                //k < i *2

                //so for example, if i =1, it will print star for 1 times, as loop will work  until k < 2, that is 1 time

                // when i = 2, condition will be k < 4, means it will print star for 3 times

                // and so on.

                for (int k = 1; k < i * 2; k++)

                {

                    Console.Write("*");

                }

                Console.WriteLine();

            }

           //loop to print inverted equilateral triangle

            for (int i = n - 1; i >= 1; i--)

            {

                 //for loop to add space

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

                {

                    Console.Write(" ");

                }

                //for loop to print *, for each line 

                //k < i *2

                //so for example, if i =1, it will print star for 1 times, as loop will work  until k < 2, that is 1 time

                // when i = 2, condition will be k < 4, means it will print star for 3 times

                // and so on.

                for (int k = 1; k < i * 2; k++)

                {

                    Console.Write("*");

                }

                Console.WriteLine();

            }

            Console.WriteLine();

    }

}