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From: "Willliam V" <nospam@nospam.com>
Subject: Re: Ada or C++ acting 'correctly' here?
Date: 1999/03/02
Message-ID: <7bg0pc$5a4$1@ffx2nh3.news.uu.net>#1/1
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References: <7b8c7u$sj1@drn.newsguy.com>
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 06:34:20 GMT)
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NNTP-Posting-Date: 2 Mar 1999 06:34:20 GMT
Newsgroups: comp.lang.ada,comp.lang.c++
Date: 1999-03-02T06:34:20+00:00
List-Id: <comp.lang.ada>

500000000*7 is a negative quantity.  C++ prints out
what you ask it to do.
try unsigned long l = 500000000*7;
cout << l;
or even
cout << ((unsigned long )500000000)*7);
If Linux 'd make the unsigned long to be 64 bit, you Ada would
have compiled fine. So the Ada compiler you are using is
relying very heavily on the underlying C machinery. Don't be
too fast to blame C or C++
Wil

bill@mooner wrote in message <7b8c7u$sj1@drn.newsguy.com>...
>Hello,
>
>compare these 2 little programs, do same thing, one in C++
>and one in Ada. The C++ program compiles Ok, but result is
>negative, the Ada program refused to compile:
>
>
>----------------------------
>#include <iostream>
>int main()
>{
>  cout<<(500000000*7);
>  return 0;
>}
>-----------------------------
>%g++ -Wall test_mult.cc
>%./a.out
>-794967296
>
>(this is g++ 2.8.1)
>
>----------------------------
>with Ada.Integer_Text_Io; use Ada.Integer_Text_Io;
>procedure Test_Multi is
>  begin
>   Put( 500000000*7 );
>  end Test_Multi;
>-----------------------------
>$gnatmake test_multi.adb
>gcc -c test_multi.adb
>test_multi.adb:6:18: value not in range of type "Standard.Integer"
>test_multi.adb:6:18: static expression raises "Constraint_Error"
>gnatmake: "test_multi.adb" compilation error
>
>
>Now. Which would you consider the correct language behaviour?
>(same machine, Pentium pro, Linux.
>
>Bill.