16

32

unpredictable

none of above

It converts the formal argument in the macro definition into a string

It strips out redundant blanks

It concatenates adjacent strings, if any.

All of the above

>>

complementation

<<

none of the above

vacant bit will be filled by the sign bit

vacant bit will be filled by 0

the outcome is implementation dependent

none of the above

either before or at the beginning of the compilation process

after compilation but before execution

after loading

none of the above