NULL
From cppreference.com
| Defined in header
<stddef.h>
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| Defined in header
<string.h>
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| Defined in header
<wchar.h>
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| Defined in header
<time.h>
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| Defined in header
<locale.h>
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| Defined in header
<stdio.h>
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| #define NULL /*implementation-defined*/
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Expands into implementation-defined null-pointer constant.
[edit] See also
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C++ documentation for NULL
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