using System;

using System.Globalization;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        // Test inputs: add any scientific notation strings here

        var testInputs = new List<string>

        {

            "1E5",

            "5E8",

            "1.23E3",

            "2.5E-5",

            "1E-2",

            "3.1415E0",

            "9.999999999999999E10",   // long double

            "1.2345678901234567890123456789E0", // max decimal precision

            "1E28",  // at decimal limit

            "1E-28"  // smallest decimal

        };

​

        Console.WriteLine("Scientific Notation → Normal Form\n");

​

        foreach (var sci in testInputs)

        {

            try

            {

                decimal number = decimal.Parse(sci, NumberStyles.Float, CultureInfo.InvariantCulture);

                string normalForm = number.ToString("0.############################", CultureInfo.InvariantCulture);

                double numberD = double.Parse(sci, System.Globalization.CultureInfo.InvariantCulture);

                long valueX = Convert.ToInt64(numberD);

​

                Console.WriteLine($"Input: {sci,-35} Output: {normalForm,-35} Output(PR): {valueX}");

            }

            catch (Exception ex)

            {

                Console.WriteLine($"Input: {sci,-35} Error: {ex.Message}");

            }

        }

    }

}

​