CODEWITHSUNDEEP
c#.netsqrt
sventevit
sventevit

Reputation: 4816

C# high precision calculations

Consider this code:

double result = Math.Sqrt(4746073226998689451);

For result I get 2178548422 instead of 2178548421.999999854etc... How can I get more precise result?

Upvotes: 5

Views: 8644

Answers (4)

Oded
Oded

Reputation: 498982

There is a bunch of high precision maths libraries for .NET mentioned on wikipedia - Arbitrary-percision artithmatic page.

I have seen BigNum recommended here before, though the wikipedia link is broken and I can't find the library elsewhere at the moment.

The other option on the page is the C# binding for MPIR.

Upvotes: 7

kol
kol

Reputation: 28688

For the particular problem, computing the square root, you can use Decimal type and Newton's algorithm:

using System;

class Program
{
  public static void Main()
  {
    long x = 4746073226998689451;
    decimal sqrt_x = (decimal)Math.Sqrt(x);
    for (int i = 0; i < 10; ++i)
      sqrt_x = 0.5m * (sqrt_x + x / sqrt_x);
    Console.WriteLine("{0:F16}", sqrt_x);
  }
}

The result is:

2178548421.9999998547197773

Upvotes: 6

pyCthon
pyCthon

Reputation: 12341

instead of double , try big integer and also check out this link

Big numbers with fraction support

Upvotes: 1

Emond
Emond

Reputation: 50672

Using digit by digit calculation will give you as many digits as you are looking for.

Upvotes: 1

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