Fact() returns the factorial of a positive integer x.
Syntax:
Fact(x)
Return data type: integer
Limitations:
If the number x is not an integer, it will be truncated. Non-positive numbers will return NULL.
Examples and results:
- Fact( 1 ): returns 1
- Fact( 5 ): returns 120 ( 1 * 2 * 3 * 4 * 5 = 120 )
- Fact( -5 ): returns NULL
