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title: "NULL (CRT) | Microsoft Docs"
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# NULL (CRT)
**NULL** is the null-pointer value used with many pointer operations and functions. It is equivalent to 0. **NULL** is defined in the following header files: CRTDBG.H, LOCALE.H, STDDEF.H, STDIO.H, STDLIB.H, STRING.H, TCHAR.H, TIME.H and WCHAR.H.  
  
## See Also  
 [Global Constants](../c-runtime-library/global-constants.md)