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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;
                answer = count * answer;
        MessageBox.Show("Please enter only a positive integer.");
    return answer;


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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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