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JokeRe: Factorials (C#) [modified] Pin
Xiangyang Liu 刘向阳18-Sep-08 6:31
MemberXiangyang Liu 刘向阳18-Sep-08 6:31 
GeneralRe: Factorials (C#) Pin
WilliamFalconerUK18-Sep-08 11:06
professionalWilliamFalconerUK18-Sep-08 11:06 
GeneralRe: Factorials (C#) Pin
Nemanja Trifunovic18-Sep-08 5:00
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GeneralRe: Factorials (C#) Pin
Xiangyang Liu 刘向阳18-Sep-08 5:08
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GeneralRe: Factorials (C#) Pin
PIEBALDconsult18-Sep-08 5:27
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GeneralRe: Factorials (C#) Pin
Dan Neely18-Sep-08 5:33
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GeneralRe: Factorials (C#) Pin
PIEBALDconsult18-Sep-08 7:06
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GeneralRe: Factorials (C#) Pin
Robert.C.Cartaino18-Sep-08 7:34
MemberRobert.C.Cartaino18-Sep-08 7:34 
Marc Clifton wrote:
I was annoyed to find that the Math class doesn't include a Factorial method

Too bad C# doesn't support extension methods for static classes. You could have written something like:
public static class MyExtensions
    public static ulong factorial(this System.Math, int factor) { ... } ;  // THIS WONT WORK

and called : ulong factorial = Math.factorial(10); But... nope.

I guess you could do this:
namespace MarcsCoolStuff
    public static class Math
        public static ulong factorial(int factor)
            ulong[] factorials = { 1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 3628800, 
                                    39916800, 479001600, 6227020800, 87178291200, 1307674368000, 
                                    20922789888000, 355687428096000, 6402373705728000, 
                                    121645100408832000, 2432902008176640000, 14197454024290336768 };

            return factorials[factor];
Wrap the array lookup around a try/catch IndexOutOfRange exception if you want bounds checking.

And now you can call:
ulong factorial = MarcsCoolStuff.Math.factorial(10); Wink | ;) Nah, don't do that. It's too obtuse to "fake" a Math class. It's screaming fast though.
GeneralRe: Factorials (C#) Pin
Single Step Debugger18-Sep-08 8:18
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AnswerRe: Factorials (C#) Pin
Ri Qen-Sin18-Sep-08 9:52
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GeneralRe: Factorials (C#) Pin
Robert.C.Cartaino18-Sep-08 11:12
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Ri Qen-Sin18-Sep-08 11:39
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GeneralRe: Factorials (C#) Pin
Marc Clifton18-Sep-08 11:23
mvaMarc Clifton18-Sep-08 11:23 
GeneralRe: Factorials (C#) Pin
Ri Qen-Sin18-Sep-08 11:46
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GeneralRe: Factorials (C#) Pin
Stuart Dootson22-Sep-08 2:02
professionalStuart Dootson22-Sep-08 2:02 
QuestionGenius or barking? Pin
Nicholas Butler18-Sep-08 4:19
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Marc Clifton18-Sep-08 4:29
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John M. Drescher18-Sep-08 4:51
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Brady Kelly18-Sep-08 4:36
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Nicholas Butler18-Sep-08 4:47
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