What is the difference from NULL and "0"?
Example:
return NULL;
return 0;
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11In what language? – Ritch Melton Mar 04 '11 at 01:55
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possible duplicate of [What is the difference between NULL, '\0' and 0](http://stackoverflow.com/questions/1296843/what-is-the-difference-between-null-0-and-0) – Logan Capaldo Mar 04 '11 at 02:00
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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.
The semantics of NULL may vary by language or application.
Glenn
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