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From: Biju Thomas <bijuthom@ibm.net>
Subject: Re: Ada or C++ acting 'correctly' here?
Date: 1999/02/27
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Newsgroups: comp.lang.ada,comp.lang.c++
Date: 1999-02-27T00:00:00+00:00
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Claudius Proculus wrote:
> 
> In article <7b8c7u$sj1@drn.newsguy.com>, bill@mooner wrote:
> >compare these 2 little programs, do same thing, one in C++
> >and one in Ada. The C++ program compiles Ok, but result is
> >negative, the Ada program refused to compile:
> >
> >
> >----------------------------
> >#include <iostream>
> >int main()
> >{
> >  cout<<(500000000*7);
> >  return 0;
> >}
> >-----------------------------
> >%g++ -Wall test_mult.cc
> >%./a.out
> >-794967296
> >
> >(this is g++ 2.8.1)
> >
> 
> They are both the correct behavior.
> 

No. The C++ compiler is non-conforming. The C++ standard says that if a
constant expression cannot be represented in the target type, the
program is ill-formed. (Chapter 5, paragraph 5.) A C++ compiler is
required to issue a diagnostic message while compiling an ill-formed
program. (It is *not* an undefined behaviour.)

> However, this does illustrate one of the benefits of using Ada.
 
Ada certainly will have benefits, but not on this one.

-- 
Best regards,
Biju Thomas