NULL is a macro defined in <stddef.h> for the null pointer.
NUL is the name of the first character in the ASCII character set. It corresponds to a zero value. There?s no
standard macro NUL in C, but some people like to define it.
The digit 0 corresponds to a value of 80, decimal. Don?t confuse the digit 0 with the value of ?? (NUL)!
NULL can be defined as ((void*)0), NUL as ??.

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