Oli Glaser wrote: > (I think you are taking addition to have precedence over subtraction) FWIW, this wouldn't be a problem, since they have same precedence and are associative (which means that the order of operations doesn't matter). Gerhard --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .