Data Types C#

using System;
using System.Globalization;
public class Example
{
   public static void Main()
   {
        double number;
        
        number = 1.6E20;
        Console.WriteLine(number.ToString());
        number = 1.6E2;
        Console.WriteLine(number.ToString());
        number = -3.541;
        Console.WriteLine(number.ToString());
        
        number = -1234567890E-07;
        Console.WriteLine(number.ToString());
        
        number = -12345678909876543E-09;
        Console.WriteLine(number.ToString());
        number = .654321;
        Console.WriteLine(number.ToString());
        
        number = .000000001;
        
        Console.WriteLine(number.ToString());
   }
}
/*
1.6E+20
160
-3.541
-123.456789
-12345678.9098765
0.654321
1E-09
*/