using System;

public class Program

{

    public static void Main()

    {

        string inputInches;

        double inches;

        double centimeters;

​

        Console.WriteLine("Conversion");

        Console.Write("Enter value of inches: ");

        inputInches = Console.ReadLine ();

​

        if (Double.TryParse (inputInches, out inches) == true)

        {

            if (inches <= 0)

            {

                Console.WriteLine("Zero or negative value is not allowed.");

            }

            else

            {

                centimeters = inches * 2.54;

                //Console.WriteLine("The equivalent value of " + inches + " inche(s) " + "in centimeters is {0:#,0.00}.", centimeters);

                Console.WriteLine("The equivalent value of {0:#,0.0000} inches is {1:#,0.00} centimeters.", inches, centimeters);

            }

        }

        else

        {

            Console.WriteLine("Invalid input.");

        }

    }

}