Semantics of char a[]

Question

I recently embarrassed myself while explaining to a colleague why

char a[100];
scanf(\"%s\", &a); // notice a & in front of \'a\'

is ve

Answer 1

char [100] is a complex type of 100 adjacent char's, whose sizeof equals to 100.

Being casted to a pointer ((void*) a), this variable yields the address of the first char.

Reference to the variable of this type (&a) yields address of the whole variable, which, in turn, also happens to be the address of the first char