> Can someone suggest a book or online reference I could print out that gets > into the details of C99 (that's the version that microchip is based on > ??) that this thread > and things like "ifndef" are covered. Microchip seems to leave out some > standard stuff, or I just haven't found where it's hiding. I like to use an HP PDF that I found for looking at the C definitions and example code. There may be obscure differences to what the microchip compilers do, but I haven't found any yet. http://docs.hp.com/en/B3901-90007/B3901-90007.pdf A 1.5MB download that makes a useful reference manual when a query comes up about how a function should be used. Also Google 'Essential C' and get the PDF from the Stanford site. --=20 Scanned by iCritical. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .