I don't expect other people to do my homework , or study for me
When the information in the "manual" is incomplete, or worse, inaccurate, then what ...
Considering in lisp, that expressions are evaluated from inside out, it would make perfect sense to expect that
(+ sum a) would produce a value that can be used with
rem. Clearly there is an error somewhere, either with the use of addition in a
rem statement, or with the values returned by addition of real numbers. Without looking into the lisp engine itself, it would be impossible to know where the problem lies, but suffice to say, this is a problem, and very likely a bug. So to that point, to insist that someone RTFM to find a resolution to a potential bug, is both unhelpful and unwarranted. I guess I expect too much ...