------- Comment #6 from pinskia at gcc dot gnu dot org 2007-01-05 19:58 ------- (In reply to comment #5) > Do the parenthesis matter in C? They do matter in say Fortran, but in C I > think > (a - 20) + (b - 20) can be evaluated as (a + b) + (-20 + -20) or a - 20 - 20 + > b > etc.
In fact, a-20 + c will be valid even if a+c overflows but (a-20) + c does not. There are comments in the standard somewhere which makes a mention of this. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30364
