http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48951
--- Comment #2 from ufo008ahw <ufo008ahw at 163 dot com> 2011-05-10 17:26:31 UTC --- (In reply to comment #1) > (gcc 3.4.2 is ancient, even if there is a bug noone will fix it in that > version) > > what is the program's input? > what is its output? > what output are you expecting? input is 1。 output is: 1 ================ 1 1 ================ 1 0 expected output is: 1 ================ 1 0 ================ 1 0 so, the difference is forth line.