another stupid array/pointer question

[Jerome Freedman]

Suppose I have a structure

    struct a {
       char * a_string;
    }

and a structure

    struct b {
	char another_string[80];
    }

 sizeof(struct a) should equal sizeof(char *)

 but what about sizeof(struct b)?
 Is the 80 character array included in the size of struct b or
 is b.another_string a pointer into somewhere  where there is
 allocated space - is this implementation defined?

  I realize this might be a "dumb" question but not as dumb as if
I didn't ask it.

                                     Jerry Freedman, Jr