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NULL is not guaranteed to be 0 -- its exact value is architecture-dependent. Most major architectures define it to (void*)0 . '\0' will always equal 0, because that is how byte 0 is encoded in a character literal.
4 mar 2011 · Conceptually, zero (0) is a number, and NULL is a value that represents "no value". As such, 0 can be added, subtracted, etc., but NULL cannot. The NULL value for a variable can indicate, for example, that a variable has not yet been assigned a value.
Null is not the same as zero, as it represents the lack of any value rather than a specific numerical value. One of the key attributes of null is its ability to indicate the unknown or missing information.
14 lut 2012 · The basic difference is that 0 is about measurable quantity, while NULL is about existence. Being a quantity, 0 represents something, i.e. a quantity, that is 0, much like 0.000000001 represents a quantity (one that in problems of every day life is in fact indistinguishably close to 0).
NULL is guaranteed to compare equal to 0 when compiled against any standards-compliant compiler (whether or not the hardware sees it that way, the compiler must generate code that makes the comparison work correctly), and NULL must always be false when evaluated as a boolean.
Zero can refer to the symbol "0". Null is usually an adjective (Null set, Null argument, Null pointer, *a nullity). Null is a not a number, usually has a different symbol each time. Programmers are forced to make these distinctions all the time (although, 'null' is often modelled as the number 0).
12 cze 2018 · The value 0 (all bits at zero) is a typical value used in memory to denote null. It means that there is no value associated with name . You can also think of it as the absence of data or simply no data .
