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From: nigel@wraxall.inmos.co.uk (Nigel Holder)
Newsgroups: comp.std.c
Subject: Weird identifier declaration
Message-ID: <1898@brwa.inmos.co.uk>
Date: 23 Aug 89 12:54:45 GMT
Sender: news@inmos.co.uk
Reply-To: nigel@inmos.co.uk ()
Organization: INMOS Limited, Bristol, UK.
Lines: 39

Reading the ANSI spec closely I found the following weird case that
enables the declaration of identifiers *after* assignment statements
within the same block by using 'sizeof (type-name)'.

The best way to illustrate this is with an example :-

int main (void)

{
	int	a;

	a = 3;

	(void) sizeof (enum colour {red, green, blue});

	printf ("red = %d, green = %d, blue = %d\n", red, green, blue);
}

The behaviour is similar to :-

int main (void)
{
	...
	{
		enum  colour {red, green, blue};

		printf ( ...
	}
}

I guess the question is was this intentional ?

(just for record you can also use the following instead of sizeof () :
	a = (enum colour {red, green, blue})3;
as well !).

Nigel Holder,  INMOS Limited  |  mail[uk]: nigel@inmos.co.uk or ukc!inmos!nigel
1000 Aztec West, Bristol, UK  |      [us]: uunet!inmos-c!nigel
Phone: +44 454  616616 x508   |  Internet: @col.hp.com:nigel@inmos-c