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From: Huy Vo <vo@CTRON.COM>
Subject: Re: Ada and robots
Date: 1997/06/30
Message-ID: <9706302316.AA23644@stealth.ctron.com>#1/1
X-Deja-AN: 253744491
Sender: Ada programming language <INFO-ADA@LISTSERV.NODAK.EDU>
Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
Newsgroups: comp.lang.ada
Date: 1997-06-30T00:00:00+00:00
List-Id: <comp.lang.ada>


>In Ada-83,
>
>when STORAGE_ERROR =>
> PUT("Storage Error for Module: " & ModuleName & "  At line: ");
>  PUT(LineCount);
>   raise;
>
>   Naturally this means you must set variables ModuleName (a string) and
>   LineCount (a positive) in the code. You also need to have
>
>       with TEXT_IO; use TEXT_IO.
>
>       and
>
>        exception
>
>        somewheres. But as your C code didn't mention the #includes required
 for
>        the use of stderr, fprintf, and the non-portable definition of __LINE__
>        I think this is fair. Especially since the Ada is completely portable.
>
>        Oh yes, the "raise" statement doesn't just give a meaningless error
 code
>        (1), it tells the caller that this is a STORAGE_ERROR, and allows them
>        to use a different technique/algorithm that won't be so
>        memory-intensive.
>
Basically you have to hard code the line number in the code?
And everytime you add or delete something before that line, you change
that hard coded number again? __LINE__ is supposed preprocessed by
a program so the programmer doesn't have to count. As to portability,
I don't know a C compiler that doesn't have __LINE__. Do you?
Do you know of 2 compilers that will not agree on the value of __LINE__
in the  following program:


#include <stdio.h> /* since you insist on having this */

main() {
        printf("the value of __LINE__ is independent of the compiler %d\n",
 __LINE__);
        return 0;
}