Coding challenge-1

                           # Coding Challenge-1

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Required Knowledge-Factorial's

Factorial of a number is simply the following Product,

To calculate factorial of  n(denoted by n!)
    
         n! = n x (n-1) x (n-2) x ................3 x 2 x 1.

Example - 
   
              4! = 4 x (4-1) x (4-2) x (4-3).
     =>  4! = 4 x 3 x 2 x 1.
     =>  4! = 24.

Similarly,

         5! = 5 x (5-1) x (5-2) x (5-3) x (5-4)
  =>  5! = 5 x 4 x 3 x 2 x 1.
  =>  5! = 120.

Challenge--

    Develop a Factorial Calculator-

    input - The Number(N) of which you want the factorial.

    output - N!

Example--

    input - 7

    output - 5040

                               All The Best