---
title: QkExitCode (v2.1)
description: API reference for QkExitCode in qiskit-c v2.1
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit-c/2.1/qk-exit-code
---

# QkExitCode

```c
enum QkExitCode
```

Function exit codes.

## Values

- **`QkExitCode_Success`**

  Success.

  Value: 0

- **`QkExitCode_CInputError`**

  Error related to data input.

  Value: 100

- **`QkExitCode_NullPointerError`**

  Unexpected null pointer.

  Value: 101

- **`QkExitCode_AlignmentError`**

  Pointer is not aligned to expected data.

  Value: 102

- **`QkExitCode_IndexError`**

  Index out of bounds.

  Value: 103

- **`QkExitCode_ArithmeticError`**

  Error related to arithmetic operations or similar.

  Value: 200

- **`QkExitCode_MismatchedQubits`**

  Mismatching number of qubits.

  Value: 201