comma operator
Steven Kilbane
skilbane at zaphod.axion.bt.co.uk
Thu Aug 3 17:32:05 AEST 1989
>From article <2963 at solo6.cs.vu.nl>, by roemer at cs.vu.nl (Roemer Lievaart):
> tada at athena.mit.edu (Michael Zehr) writes:
> I often write:
>
> if (something_goes(wrong) )
> fprintf(stderr, "%s: I give up!\n", argv[0] ) ,
> exit(2) ;
>
> Of course it's no better than using { ; }, but it's not worse either.
Personally, I think it is worse that {;}. If you have something of the form
x = Expr1 , Expr2;
then Expr2 will be assigned to x, rather than Expr1. If you rewrite them as
x = Expr1,
Expr2;
you're relying on (a) the indentation and (b) being very careful, to notice you
have a comma instead of a semicolon. Inserting extra code might be nasty:
x= Expr1,
Expr3;
Expr2;
*BOOM*...
-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo-oOo
Stephen Kilbane |Email: skilbane at uk.co.bt.axion
British Telecom Research Laboratories|or smk-a at uk.ac.york.minster (or, if that
Martlesham Heath |doesn't work, root at uk.ac.york.softeng -
Ipswich IP5 7RE (0473 646638) |not me, but it may be passed on....
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