TEAM-ADA Archives

Team Ada: Ada Programming Language Advocacy

TEAM-ADA@LISTSERV.ACM.ORG

Options: Use Classic View

Use Proportional Font
Show Text Part by Default
Condense Mail Headers

Topic: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Content-Transfer-Encoding: 7bit
Sender: "Team Ada: Ada Advocacy Issues (83 & 95)" <[log in to unmask]>
From: Geoff Bull <[log in to unmask]>
Date: Wed, 11 Nov 1998 21:17:08 +1100
Content-Type: text/plain; charset=us-ascii
MIME-Version: 1.0
Reply-To: Geoff Bull <[log in to unmask]>
Parts/Attachments: text/plain (25 lines)
"W. Wesley Groleau x4923" wrote:

>
> My C books emphasize the fact that the size and range of anything other
> than "char" is not portable.

Even char is not portable!
It is signed on some platforms (range -128 .. 127)
and unsigned on others (range 0 .. 255).
This has caused me huge headaches porting code taht
had been written with no respect for this fact.
Actually the ranges above are not guaranteed, only typical.
By definition sizeof(char)==1 but a char is not necessarily 8 bits.

As Stroustrup wrote in 'The  C++ Programming Language':
"Writing truly portable low-level code is harder ... it is usually safe
to assume that a char can hold integers in the range 0 .. 127"

Of course, with Ada, we don't have to "assume" anything,
and we don't have to write programs that "usually" work.
And writing truly portable code is generally not that hard.

Cheers
Geoff

ATOM RSS1 RSS2