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# PetscInt

PETSc type that represents an integer, used primarily to represent size of arrays and indexing into arrays. Its size can be configured with the option `--with-64-bit-indices` to be either 32-bit (default) or 64-bit.

## Notes

For MPI calls that require datatypes, use `MPIU_INT` as the datatype for `PetscInt`. It will automatically work correctly regardless of the size of `PetscInt`.

## See Also

`PetscBLASInt`, `PetscMPIInt`, `PetscReal`, `PetscScalar`, `PetscComplex`, `PetscInt32`, `PetscInt64`, `MPIU_REAL`, `MPIU_SCALAR`, `MPIU_COMPLEX`, `MPIU_INT`, `PetscIntCast()`

## Level

beginner

## Location

include/petscsystypes.h

Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages