Path: utzoo!attcan!ncrcan!scocan!ron
From: ron@sco.COM (Ron Irvine)
Newsgroups: comp.lang.c++
Subject: FORever
Message-ID: <1990Sep27.150948.9109@sco.COM>
Date: 27 Sep 90 19:09:48 GMT
Reply-To: ron@sco.COM (Ron Irvine)
Organization: SCO Canada, Inc. (formerly HCR Corporation)
Lines: 26


BEWARE there is a major problem with C++'s "for" statement.

main() {
	for (int i=10; i<13;) {
		for (int i=0; i<3; ++i)
			; // stuff
		++i;
	}
}

Cfront accepts this code and compiles without warning.
The resulting code is totally unexpected!
The program loops forever?!!

I realize the problem is that cfront does not end the
scope of the inners loop's "i" until the end of the
outer loop, thus the "++i;" statement actually increments
the inner loops "i" whos scope is the outer loop.  And I
did not "redeclare" "i" in the outer loop since the outer
"i"'s scope is outside the outer loop.

This is a bad joke for a language that is designed for the 90's.
The scope of a variable in a "for-init-statement" MUST end
at the end of the "for" statement. Lets change the definition of
the language NOW before we inflict horrendous pain on C++ programmers.