On Fri, Oct 8, 2010 at 1:27 PM, Tom Limoncelli <t...@whatexit.org> wrote: > I see this in code now and then: > > 1<<16-1 > > Python and C interpret that as "1 << (16 - 1)", which is 32768. > > The programmer usually means "(1 << 16) - 1", which is 65535. > > There's a big difference, especially if you are using these for bit masks: > > 32768 = 1000000000000000 > 65535 = 1111111111111111 > > Tom
P.S. You can use Google Code Search to find other people that make this mistake: http://www.google.com/codesearch?hl=en&lr=&q=1%3C%3C16-1&btnG=Search -- http://EverythingSysadmin.com -- my blog (new posts Mon and Wed) http://www.TomOnTime.com -- my advice (more videos coming soon) _______________________________________________ Tech mailing list Tech@lopsa.org http://lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
