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Fact() returns the factorial of a positive integer x.



Return data type: integer


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

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