Is it guaranteed that memset will zero out the padding bits in a structure?

Question

In general ,as per C standard is it guaranteed that memset() with 0 will zero out the padding bits in a C structure?

What about gcc?

For example , something lik

Answer 1

Perhaps worth noting that memset doesn't know anything about your struct (or array, or primitive, or any chunk of memory whatsoever that you happen to unleash it on), so even if it wanted to leave the padding bits intact, it wouldn't even know where they are.