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Old 12-18-2017, 03:20 AM   #16
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NULL macro is defined in stdio.h/stddef.h and represents a zero. Any pointer pointing to 0x0 location is null pointer.
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Old 01-18-2018, 02:18 AM   #17
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The C library Macro NULL is the value of a null pointer constant. It may be defined as ((void*)0), 0 or 0L depending on the compiler vendor.
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Old 02-12-2018, 01:50 AM   #18
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ULL macro is same as any other macros which will be replaced by its macro body during preprocessor stage of compilation.
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