Comma Operator

[Andrew Koenig]

In article <922 at quintus.UUCP>, nair at quintus writes:
> What should this print?
> 
> 	int x, y;
> 	printf("%d %d\n", (x = 1, y = 2), x, y);

Whatever the compiler wants to print.

> Shouldn't it be equivalent to:
> 
> 	int a, x, y;
> 	a = (x = 1, y = 2);
> 	printf("%d %d %d\n", a, x, y);

No.

The arguments of printf are not required to be evaluated
in any particular sequence.

> Is there God? Why am I here? :-) :-)

The first question is too difficult for comp.lang.c
The second can be divided into two parts.

Part 1: `Why?'  This is an extremely difficult question as well,
so it is left as an exercise for the reader.

Part 2: `Am I here?'  Answer: yes.
-- 
				--Andrew Koenig
				  ark at europa.att.com