[REBOL] Re: order of evaluating expressions..
From: SunandaDH::aol::com at: 23-Dec-2004 14:32
Eric:
> Correct me if I'm wrong but I was always under the impression we
> evaluated the way we do because that's how *math* required them to be
> evaluated.
That's true.
But there may be more items in a computer language than you learned in
school. And the order of precedence of them may not be so intuitive.
What is the "correct" order of precedence for?
5 or 7 * 6 and 3
The C language, for example, solves this by having a dozen levels of
precedence (In C AND is above OR. Times is above both of them. At least, I think
that's right -- and that's one of the problems of having a dozen levels: you need a
good memory)
REBOL solves that problem in a different way -- by just doing things left to
right. That creates its own problems at times too -- a naturalistic line like
this is tripped by that rule, meaning parentheses are needed:
if length? "aa" = length? "bbb" [print 'true]
Sunanda.
