# Fact

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