Article View: comp.std.c++
Article #3166Re: Incompatibility C++ <-> ANSI-C
From: Mike Ball
Date: Wed, 31 Jan 1996 22:10
Date: Wed, 31 Jan 1996 22:10
40 lines
1689 bytes
1689 bytes
In article h7q@fsuj01.rz.uni-jena.de, mkt@isun04.inf.uni-jena.de
(Tilo Koerbs) writes:
> Does the operator ?: an itegral promotion on its
> second and third operand in C++?
> I cannot find the answer in the ARM. (I think it says: no)
>
> Consider this:
> char x, y;
> Which type has the following expression:
> (a ? x : y)
>
> In ANSI-C the type is clearly an 'int' (or 'unsigned').
> But the type in C++ is 'char'???
>
> Even different compilers have different results!
> (Borland 3.1: 'char', SPARCompiler 4.0: 'int')
Not in any version of SPARCompiler C++ that I have access to, which is
all of those from 4.0.1 on. The result is clearly "char". I don't
have a 4.0 version to check.
The test was
extern "C" printf(const char*, ...);
int i;
int main()
{
char a = 0;
char b = 0;
printf("%d\n", sizeof(i ? a : b));
return 0;
}
the result was "1"
-Mike-
---
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From: ball@eng.sun.com (Mike Ball) Message-ID: <4eo5gl$rik@engnews2.Eng.Sun.COM> X-Original-Date: 31 Jan 1996 16:31:17 GMT Path: arc1-ca.pugleaf.net!in1.uu.net!bounce-back Date: 31 Jan 96 22:10:04 GMT Approved: fjh@cs.mu.oz.au Newsgroups: comp.std.c++ Subject: Re: Incompatibility C++ <-> ANSI-C Organization: Sun Microsystems Inc. References: <4ekpnj$h7q@fsuj01.rz.uni-jena.de> Reply-To: ball@eng.sun.com X-Auth: PGPMoose V1.1 PGP comp.std.c++ iQBFAgUBMQ/o4eEDnX0m9pzZAQFmkQF+NoBckBu+CQgG/HGwZSsQBW1C5yOWc7DE rEKJHrOefFiJRlklzrts8KyU756LYlcL =9ETv