Details

Returns the factorial of an integer number. The factorial of a number N is determined as follows: N! = 1 x 2 x 3 x 4 x ... x N, however factorial of 0 is 1.

Parameters

val = any integer number

Example

Fac(5) returns 120
Fac(0) returns 1

Note

Fac() cannot take unit as arguments. Negative number will cause an error.