Calculate the factorial of an integer in C # convert

Calculate the factorial of an integer in C # Andrew rissing , 18 Oct 2011

5.00(8 votes)

Or you coshould just go the other direction and cache the known results ahead of time. you're only looking at 13 numbers in all, so it is not a big memory hog to just store those known values inside of the method and be done with it.
 

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 Static   Uint Factorial ( Uint X ){ If (X> 12 ) Throw   New Argumentexception ( "  Cannot calculate a factorial for numbers larger than 12" ); Return _ Factorials [X];} Static  Readonly   Uint [] _ Factorials = New   Uint [ 13 ] { 1 , 1 , 2 , 6 , 24 , 120 , 720 , 5040 , 40320 , 362880 ,3628800 , 39916800 , 479001600 };