C associativity rules

[Doug Gwyn]

In article <804 at proxftl.UUCP> francis at proxftl.UUCP (Francis H. Yu) writes:
>"a && b" is a control structure which implies
>	"if (a) if (b) ... "
>It has nothing to do with the order of evaluation of expression.

That is quite wrong.  "&&" is a binary operator", a && b" is an
expression, and the subexpression "a" is required to be evaluated.
Then, if the value of "a" is nonzero, the expression "b" is required
to be evaluated; otherwise "b" is required to NOT be evaluated.  The
following C statements are legal and useful:
	c = a && b;
	d = e + (a && b);