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Asked: 2026-05-12T08:31:29+00:00

I’m trying to compute 100! and there doesn’t seem to be a built-in factorial

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I’m trying to compute 100! and there doesn’t seem to be a built-in factorial function. So, I’ve written:

Protected Sub ComputeFactorial(ByVal n As ULong)
        Dim factorial As ULong = 1
        Dim i As Integer
        For i = 1 To n
            factorial = factorial * i
        Next
        lblAnswer.Text = factorial
    End Sub

Unfortunately, running this with the value of 100 for n rseults in

Value was either too large or too
small for a UInt64.

So, is there a larger data type for holding numbers? Am i mistaken in my methods? Am I helpless?

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1 Answer

  1. Editorial Team

    Sounds like Project Euler.

    .NET 4.0 has System.Numerics.BigInteger, or you can pick up a pretty sweet implementation here:
    C# BigInteger Class

    Edit: treed 🙁

    I’ll add – the version at CodeProject has additional features like integer square root, a primality test, Lucas sequence generation. Also, you don’t have direct access to the buffer in the .NET implementation which was annoying for a couple things I was trying.

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