---
description: "Learn more about: Null directive"
title: "Null directive"
ms.date: "08/29/2019"
helpviewer_keywords: ["preprocessor directives, Null", "null directive", "preprocessor directives", "preprocessor, directives"]
ms.assetid: df59990f-b420-43f3-b415-5c25493abeee
---
# Null directive

The null preprocessor directive is a single number sign (**#**) alone on a line. It has no effect.

## Syntax

> **#**

## See also

[Preprocessor directives](../preprocessor/preprocessor-directives.md)