**petsc-3.15.0 2021-04-05**

# PetscIntCast

casts a PetscInt64 (which is 64 bits in size) to a PetscInt (which may be 32 bits in size), generates an error if the PetscInt is not large enough to hold the number.
### Synopsis

PETSC_STATIC_INLINE PetscErrorCode PetscIntCast(PetscInt64 a,PetscInt *b)

Not Collective

### Input Parameter

### Output Parameter

Notes: If integers needed for the applications are too large to fit in 32 bit ints you can ./configure using --with-64-bit-indices to make PetscInt use 64 bit ints

Not available from Fortran

### See Also

PetscBLASInt, PetscMPIInt, PetscInt, PetscMPIIntCast(), PetscBLASIntCast(), PetscIntMultError(), PetscIntSumError()

### Level

advanced

### Location

include/petscsys.h

Index of all Sys routines

Table of Contents for all manual pages

Index of all manual pages