# Fact Script and chart function

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:

Examples and results

| Examples | Results |
| --- | --- |
| `Fact( 1<br>)` | Returns 1 |
| `Fact( 5<br>)` | Returns 120 ( 1 \* 2 \* 3 \* 4 \* 5 = 120 ) |
| `Fact( -5<br>)` | Returns NULL |