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by gods
on Feb 11, 2000 at 00:06 UTC ( #3333=superdoc: print w/replies, xml ) Need Help??

Like toolic, I work on the principle of "when in doubt, parenthesize." I've also dealt with optimizing compilers that would handle something like

do i = 1, 10 do j = 1, 10 do k = 1, 10 l = i + j + k enddo enddo enddo

differently from

do i = 1, 10 do j = 1, 10 do k = 1, 10 l = (i + j) + k enddo enddo enddo

in that it would not recognize i + j as constant in the innermost loop in the first fragment, but would in the second. There are also cases where I've needed to force a specific order of operations to preclude under or overflow.

I also won't rule out the possibility that, unlike the compiler, I can get confused about logical tests that have multiple and's, or's, and not's; using (perhaps superfluous) parentheses will reduce my confusion.


Information about American English usage here and here. Floating point issues? Please read this before posting. — emc


In reply to Re: Burned by precedence rules by swampyankee
in thread Burned by precedence rules by w-ber

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