convert very big exponential to decimal in c#

Question

5.35754303593134E+300 to 53575430359313400000000000000000000 ... 000000000

Can anyone do this because this number is very large?

I have tried:

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

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            double s = double.Parse((System.Math.Pow(2, 999)).ToString(), System.Globalization.NumberStyles.Float);
            Console.WriteLine("value={0}", s);
            Console.ReadKey();
        }
    }
}

For future reference, you don't need to add `
` tags in code, just indent it all by four spaces and the built-in formatting will detect it as code. — Chris Mantle, Apr 29 '15 at 10:28
Its not working. it gives--- Value was either too large or too small for a Decimal. — Amit Pradhan, Apr 29 '15 at 10:30

score 1 · Accepted Answer · answered Apr 29 '15 at 10:29

1

Do one of the following,

Console.WriteLine(s.ToString("N0")); //comma separated
Console.WriteLine(s.ToString("F0"));

Both works.

answered Apr 29 '15 at 10:29

Abhishek

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Welcome. Maybe, you want to mark the answer as well, as your question is answered. – Abhishek Apr 29 '15 at 10:35

Soner Gönül · Answer 2 · 2015-04-29T10:58:51.450

Your title and your code says different things but..

Basicly, you can't. decimal can't hold this value because it is way outside of it's range. It's range from 7.9 x 10²⁸ to 7.9 x 10²⁸.

You can save it on double (which Math.Pow return type and you don't even need to get it string representation and parse it to double again in such a case) or BigInteger.

double s = Math.Pow(2, 999);

or

BigInteger s = (BigInteger)Math.Pow(2, 999);

If you wanna get this value it's string representation, you can use "E" standard numeric format like;

s.ToString("E14") // 5,35754303593134E+300

Or you can use Jon Skeet's DoubleConverter class which exact representation of it's value;

DoubleConverter.ToExactString(s) // 5357543035931336604742125245300009052807024058527668037218751941851755255624680612465991894078479290637973364587765734125935726428461570217992288787349287401967283887412115492710537302531185570938977091076523237491790970633699383779582771973038531457285598238843271083830214915826312193418602834034688

@amitpradhan Added as an example with it's value and it's string representations part. — Soner Gönül, Apr 29 '15 at 11:00

convert very big exponential to decimal in c#

2 Answers2