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Calculate the Factorial of an Integer in C#

, 4 Oct 2011
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I looked for a while over the net for a way to easily calculate a factorial value (n!), but nothing was helping and I saw some VERY long and drawn out solutions. Well, it wasn't that hard after I thought about it for a while and this was the easiest solution I could come up with. I hope it helps!
 
The code below is what I put in my event handler. The comment lists my class variables used.
 
int Factorial(int input)
{
    int answer = 0;
 
    if (input > 0)
    {
        count = 1;
        while (count <= input)
        {
            if (count == 1)
            {
                answer= 1;
                count++;
            }
            else
            {
                answer = count * answer;
                count++;
            }
        }
    }
    else
    {
        MessageBox.Show("Please enter only a positive integer.");
    }
 
    return answer;
}

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mcjohnson
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Comments and Discussions

 
QuestionFail for higher order numbers PinmemberCyberSamuraiii13-May-14 7:21 
QuestionZero factorial is not undefined PinmemberMember 806338616-Aug-13 3:06 
QuestionSlight Improvement Pinmembermarkbb3322-Feb-13 18:36 
GeneralMy vote of 1 Pinmemberfujiwara129-Oct-12 3:26 
GeneralReason for my vote of 1 Really you couldn't find any iterati... PinmemberKerem Kat12-Oct-11 8:55 
GeneralI've reworked the method to make it more generic and cleaner... PinadminChris Maunder4-Oct-11 2:47 
GeneralShouldn't the <code>tbxAnswer.Text = total.ToString("n0");</... PinmemberGeorge Swan3-Oct-11 20:46 

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