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From: brett@wjvax.UUCP (Brett Galloway)
Newsgroups: net.lang.c
Subject: Re: for != while
Message-ID: <755@wjvax.wjvax.UUCP>
Date: Thu, 4-Sep-86 15:40:30 EDT
Article-I.D.: wjvax.755
Posted: Thu Sep  4 15:40:30 1986
Date-Received: Sun, 7-Sep-86 04:08:43 EDT
References: <86900030@haddock>
Reply-To: brett@wjvax.UUCP (Brett Galloway)
Organization: Watkins-Johnson Co., San Jose, Calif.
Lines: 25

In article <86900030@haddock> version B 2.10.3 4.3bsd-beta 6/6/85; site wjvax.wjvax.UUCP wjvax!qubix!saber!sun!decwrl!pyramid!hplabs!qantel!lll-lcc!lll-crg!nike!think!ima!haddock!karl karl@haddock writes:
>
>It's well known that the equivalence between for and while breaks down if
>there's a "continue" statement.  Here's another case I just discovered:
>
>main() {
>	char *foo = "outer";
>	for (;; printf(foo),exit(0)) {
>		char *foo = "inner";
>	}
>}
>
>This prints "outer" (vax SVR2 compiler), though the for-while equivalence
>might lead one to expect "inner".
>
I don't understand why.  The value "inner" is associated with the variable
foo with scope inside the for loop (within the {}'s).  The value "outer"
is associated with the variable foo with scope outside the for loop (outside
the {}'s).  The printf(foo) is outside the for loop scope, so it should
print "outer".

-- 
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Brett Galloway
{pesnta,twg,ios,qubix,turtlevax,tymix,vecpyr,certes,isi}!wjvax!brett