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From: jim@kovacs.UUCP
Newsgroups: net.lang.c,net.bugs.4bsd
Subject: Block Structure Declarations
Message-ID: <173@kovacs.UUCP>
Date: Thu, 24-May-84 11:59:31 EDT
Article-I.D.: kovacs.173
Posted: Thu May 24 11:59:31 1984
Date-Received: Mon, 28-May-84 05:54:08 EDT
Organization: Robt Abel & Assoc, Hollywood
Lines: 28
Xref: 567 223

>
According to K&R in "The C Programming Language" Sect 4.8, page 81:

   "Declarations of variables (including initializations)
   may follow the left brace that introduces *ANY* compound
   statement, not just the one that begins a function.
   Variables declared in this way supersede any identically
   named variables in outer blocks..."

Three examples are given. One example not given is:

	f(x)
	double x;
	{
		short x;
		...
	}

Within function "f", occurences of "x" refer to the internal "short"
variable. The compiler will not say a word about this. Lint says
"argument x unused in function f". Since I cannot think of a single
case where one would intentionally do this, I think the compiler
should warn that argument x is being redeclared.

-Jim Keating-
R. Abel & Assoc.
Hollywood, CA 90038
(213) 462 8100