How to print 200 digits after decimal point.

1.  Given a integer N, print the decimal form of 1/2n.
Example:
N=1, print 0.5
N=2, print 0.25
Adding leading/unsignificant zeroes will lead to wrong answer. Example, printing 0.50 instead of 0.5 in above case will lead to wrong answer.


So correct output of 100 will be 0.0000000000000000000000000000007888609052210118054117285652827862296732064351090230047702789306640625
Output for 50 : 0.00000000000000088817841970012523233890533447265625
Output for 200 : 0.0000000000000000000000000000000000000000000000000000000000006223015277861141016250579646224554209682103144689201443821087459887188032139105827696600570131548979236366311772064357280932527780316951302892084253444264507759697835354018025100231170654296875

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Divideby2
{
    class Program
    {
        static void Main(string[] args)
        {
            int t = Convert.ToInt32(Console.ReadLine());
            int[] a = new int[t];
            for (int i = 0; i < t; i++)
            {
                a[i] =Convert.ToInt32(Console.ReadLine());
            }
            for (int j = 0; j < t; j++)
            {
               double n = a[j];
               string res = (1 / (Convert.ToDouble(Math.Pow(2, n)))).ToString();
               decimal d = decimal.Parse(res, System.Globalization.NumberStyles.Any);
               Console.WriteLine(d);
            }
            Console.Read();
        }
    }
}