Expression sequencing query

[Dale Worley]

> In article <760 at oakhill.UUCP> tomc at oakhill.UUCP (Tom Cunningham) writes:
> >	/* a = b + b + b */
> >	a = ((b=1),b) + ((b=2),b) + ((b=3),b)
> >
> >I expected the result to be 6.  With the Microsoft C compiler and the
> >compiler on the Sun 3, the result is 9.  Apparently the parenthetical
> >assignments are all getting done before the comma and addition.  Any
> >thoughts on this?

Harbison&Steele (7.11) makes it clear that an implementation must
evaluate one argument of a binary operator completely before starting
evaluation of the other argument.  Thus, the result should be 6.  I
don't know what the ANSI standard says.

Dec VAX Ultrix gives 9.

Lattice C 3.00 for MS-DOS gives 7!!!  (Yes, that's "7", not a typo!)

Dale