a field can be unnamed

a field can be of width 0

if a field is unnamed, its width must not be zero

a field must have a name

x is a four digit integer

x cannot be greater than a four digit integer

x is a four-bit integer

none of the above

from left to right

from right to left

in a way that depends on the implementation

none of the above

takes care of conditional compilation

takes care of macros

takes care of include files & acts before compilation

All of the above

need not start on a new line

need not start on the first column

has # as the first character

comes before the first executable statement