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From: Matthew Heaney <matthew_heaney@acm.org>
Subject: Re: Ada or C++ acting 'correctly' here?
Date: 1999/02/27
Message-ID: <m3hfs82by3.fsf@mheaney.ni.net>#1/1
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Sender: matt@mheaney.ni.net
References: <7b8c7u$sj1@drn.newsguy.com>
NNTP-Posting-Date: Sat, 27 Feb 1999 05:46:48 PDT
Newsgroups: comp.lang.ada,comp.lang.c++
Date: 1999-02-27T00:00:00+00:00
List-Id: <comp.lang.ada>

bill@mooner writes:

> 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:

...

> test_multi.adb:6:18: value not in range of type "Standard.Integer"
> test_multi.adb:6:18: static expression raises "Constraint_Error"

...

> Now. Which would you consider the correct language behaviour?
> (same machine, Pentium pro, Linux.


You may be comparing apples and oranges.

I you want to duplicate the C++, then use a modular type.  Instantiate
Text_IO.Modular_IO on Interfaces.Unsigned_32, and then compare results.
(Print out the values in hex.)

The other thing you could try is to create a non-static value in the Ada
program, and then be sure to compare with overflow checks off (the
default in gnat).  This would be closer to the C++ program.

The fact that the Ada code refuses to compile, you should regard as a
Good Thing, since it doesn't make any sense to try to print out an
unrepresentable value.