Re: Ambiguities

[Harry Kalogirou <harkal@gmx.net>]

Την Κυρ, 21-04-2002 στις 22:50, ο/η Riley Williams έγραψε:
> Hi Harry.
> 
> > I noticed in the CHANGELOG that you resolved some ambiguities in the
> > source. As far as I know X =* Y doen't mean X = X * Y, that is X *=
> > Y. I wonder what are you trying to say?
> 
> The problem here is an old one - the original K&R C specification
> allowed the operation assignment combinations to be specified either
> way round, so the sequences *= and =* *CAN* be regarded as the same.
> The same is also true of the other operators. I hit this problem at
> university back in 1996, as the standard C compiler on one of the
> systems was an old compiler that actually implemented that behaviour,
> and the standard compilers on the other machines were newer ones that
> didn't implement it.
> 
> Most current C compilers do not implement that aspect of K&R and, as far
> as I know, bcc is amongst the ones that didn't. However, when indent
> pointed them out to me, I felt that the safest solution was to simply
> get rid of the ambiguities in the first place, so I went through the
> code and did just that. The sequence I used was to do `make dup` to
> create a test copy of the source, then do `make indent` on the test
> copy to locate the occurrances, and finally to edit the original copy
> and insert the spaces needed to remove the ambiguities.
> 
> Best wishes from Riley.
> 

Very interesting _feature_... I wonder what was they thinking!!?

Harry



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