Factorial of a Number

Definition : It just means to multiply a series of descending natural numbers. (symbol :-    ! )

For Example :  1) 3! = 3 x 2 x 1 = 6

                         2) 5! = 5 x 4 x 3 x 2 x 1 = 120 

Note : 1! is 1 and 0! is also 1

Factorials are use in many fields of Mathematics but particularly in Permutation and Combination.

Note : We can have factorial for negative numbers as well as decimal numbers but we need to get into a subject called the "Gamma Function"

Program to Calculate Factorial of a Number

Enter Number
Result

Note : The above program may show result for decimal number which is incorrect

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