---
title: QfExitCode (latest version)
description: API reference for QfExitCode in the latest version of qiskit-fermions-c
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit-fermions-c/qf-exit-code
---

# QfExitCode

### QfExitCode

`enum QfExitCode`

Integer exit codes returned to C.

*Values:*

#### enumerator QfExitCode\_Success

`0`: Success.

#### enumerator QfExitCode\_CInputError

`100`: Error related to data input.

#### enumerator QfExitCode\_NullPointerError

`101`: Unexpected null pointer.

#### enumerator QfExitCode\_AlignmentError

`102`: Pointer is not aligned to expected data.

#### enumerator QfExitCode\_IndexError

`103`: Index out of bounds.

#### enumerator QfExitCode\_DuplicateIndexError

`104`: Duplicate index.

#### enumerator QfExitCode\_ValueError

`200`: Error related to some in- or output value. Refer to the function documentation for more details.