All preprocessor operators are listed from lowest priority to highest. If more than one operator is listed on a line, all operators on the same line have equal priority. The first column indicates the associativity of the operator.
Right @
Right , (Yes, comma is treated as an operator)
Right <-
Left = ->
Left #
Left || | ^ '|
Left && & '&
Right ! ~
Non assoc. < > == <= >= !=
Non assoc. '< '> '== '<= '>= '!= $LT $GT $EQ $LE $GE $NE
Non assoc. << >>
Left + - '+ '-
Left * / % '* '/
Right **
Right unary + unary - unary '+ unary '-
Right ' (indirection)