NULL and zeros

Hey,

Are there not highly specialized and still existing and used platforms
where NULL is not a sequence of zeros, so that "char *a = NULL;" and
"char *a; memset (&a, 0, sizeof (a));" are not equivalent?

In other words, do I care about possible difference between NULL and
zero-filled pointer if e.g. I assume the target platform can run X
or it is Windows?

Thanks,
Yevgen
.

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