Is it legal to use memset(…, 0, …) on an array of doubles?

Question

Is it legal to zero the memory of an array of doubles (using memset(…, 0, …)) or struct containing doubles?

The question implies two different things:

Answer 1

As Matteo Italia says, that’s legal according to the standard, but I wouldn’t use it. Something like

double *p = V, *last = V + N;  // N is count
while (p != last) *(p++) = 0;

is at least twice faster.