# 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.

## Level
beginner

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


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[Index of all DT routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
