Variable "cluster" to count factorial in c#

Question

Trying to count factorial of a big number, for example 1000!

static void Main(string[] args)
        {
            UInt64 fact = 1;

            for (UInt64 i = 1000; i > 0; i--)
            {
                fact = fact * i;
            }
            Console.WriteLine(fact); //returns 0, due to overflow UInt64, max fact is 56!

            Console.ReadKey();
        }

So i ask, if there is some way to join more variables to cluster, so i can make really large variable to store "big" number.

can use [BigInteger](http://msdn.microsoft.com/en-us/library/system.numerics.biginteger.aspx) for even bigger numbers — Tigran, Nov 21 '12 at 09:26
http://stackoverflow.com/questions/930611/working-with-very-large-integers-in-c-sharp — Anand Gautam, Nov 21 '12 at 09:28

score 5 · Accepted Answer · answered Nov 21 '12 at 09:26

5

You can use a BigInteger. This type can store integers of arbitrary size, until you run out of memory.

answered Nov 21 '12 at 09:26

Mark Byers

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score 2 · Answer 2 · edited May 23 '17 at 12:12

2

In .NET 4 BigInteger will do what you want.

Big integers in C# may be of more interest as well since it is a very similar question (well, more a very similar answer).

edited May 23 '17 at 12:12

Community

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answered Nov 21 '12 at 09:26

Chris

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Variable "cluster" to count factorial in c#

2 Answers2