From: alex@MIMSY.CS.UMD.EDU (Alex Blakemore)
Subject: Re: Mixing logical operators
Date: 5 Jan 93 21:08:56 GMT [thread overview]
Message-ID: <63166@mimsy.umd.edu> (raw)
In article <1993Jan5.180216.7426@fcom.cc.utah.edu> swillden@news.ccutah.edu (Sh
awn Willden) writes:
> if i=5 and j=2 or k=3 then
> the VAX Ada compiler complains that logical operators cannot be intermixed.
> Is the VAX compiler wrong?
The VAX compiler is correct, as usual.
Parenthesis are required when different logical operators
appear in the same expression. The LRM expresses this as a
BNF rule (see 4.4(2)), but its also illustrated
in the last two examples in 4.4(6).
Its not such a bad rule. The extra parenthesis will help others
read your code, but I'm glad they didnt extend the idea to arithmetic
operators (where the precedence conventions are well established).
--
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Alex Blakemore alex@cs.umd.edu NeXT mail accepted
next reply other threads:[~1993-01-05 21:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
1993-01-05 21:08 Alex Blakemore [this message]
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1993-01-05 23:15 Mixing logical operators Mark A Biggar
1993-01-05 18:02 agate!dog.ee.lbl.gov!hellgate.utah.edu!fcom.cc.utah.edu!swillden
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