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.