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# PetscDTFactorialInt
Compute n! as an integer 
## Input Parameter

- ***n -*** a non-negative integer



## Output Parameter

- ***factorial -*** n!





## Note
This is limited to n such that n! can be represented by `PetscInt`, which is 12 if `PetscInt` is a signed 32-bit integer and 20 if `PetscInt` is a signed 64-bit integer.


## See Also
 `PetscDTFactorial()`, `PetscDTBinomialInt()`, `PetscDTBinomial()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/include/petscdt.h.html#PetscDTFactorialInt">include/petscdt.h</A>


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