Double factorial Calculator

Calculates the double factorial x!!.

    1. real number

x!! 
    1.  
    Double factorial
    [1-9] /9Disp-Num
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    [1]  2021/10/26 23:38   Under 20 years old / High-school/ University/ Grad student / Useful /
    Comment/Request
    28488504 is the highest integer value possible on this calculator
    [2]  2021/10/26 23:30   Under 20 years old / High-school/ University/ Grad student / Useful /
    Purpose of use
    Checking if my code is correct
    [3]  2020/04/09 09:50   20 years old level / High-school/ University/ Grad student / Useful /
    Purpose of use
    checking my code
    Comment/Request
    Code still bad, this on the other hand, pretty damn good.
    [4]  2020/01/09 05:57   Under 20 years old / Elementary school/ Junior high-school student / Very /
    Purpose of use
    curiosity
    [5]  2019/05/12 16:04   Under 20 years old / Elementary school/ Junior high-school student / Very /
    Purpose of use
    To check
    Comment/Request
    Very good.
    [6]  2018/03/06 20:11   Under 20 years old / Elementary school/ Junior high-school student / Useful /
    Purpose of use
    educational
    [7]  2018/01/03 10:33   20 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    educational
    [8]  2017/11/07 14:18   Under 20 years old / High-school/ University/ Grad student / Very /
    Purpose of use
    Discovery
    [9]  2014/11/03 01:45   20 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    refresher
    Comment/Request
    n/a

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