When are you able to return NULL as the returning value of a C function?

Question

I was wondering if you could tell me when you are able to return NULL, as the result of a function in C.

For instance int lenght() can\'t retur

Answer 1

When are you able to return NULL as the returning value of a C function

In general, if and only if the function returns a pointer type:

T * function( | void>); /* With T being any valid type. */

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There are other, corner cases, which depend on the C implementation in use.