PETSc version 3.16.5
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# PetscIntMultError

Computes the product of two positive PetscInt and generates an error with overflow.

### Synopsis

    PETSC_STATIC_INLINE PetscErrorCode PetscIntMultError(PetscInt a,PetscInt b,PetscInt *result)

Not Collective

### Input Parameters

| a | - the PetscInt value
| b | - the second value

### Output Parameter

| result | - the result as a PetscInt value, or NULL if you do not want the result, you just want to check if it overflows

Use PetscInt64Mult() to compute the product of two 32 bit PetscInt and store in a PetscInt64 Use PetscIntMultTruncate() to compute the product of two PetscInt and truncate it to fit in a PetscInt

Not available from Fortran

Developers Note: We currently assume that PetscInt addition does not overflow, this is obviously wrong but requires many more checks.

### See Also

PetscBLASInt, PetscMPIInt, PetscInt, PetscBLASIntCast(), PetscIntMult64(), PetscIntSumError()

### Level

advanced

### Location

include/petscsys.h
Index of all Sys routines
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Index of all manual pages