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

'x' is same as "x"

length of the string "x" is two

Unless otherwise specified, the first name in an enum has the value 1

None of the above