Message-Id: <m0xKjhW-000S1kC@inti.gov.ar>
Comments: Authenticated sender is <salvador AT natacha DOT inti DOT gov DOT ar>
From: "Salvador Eduardo Tropea (SET)" <salvador AT inti DOT edu DOT ar>
Organization: INTI
To: Guan Foo Wah <djgpp AT rocketmail DOT com>, djgpp AT delorie DOT com
Date: Mon, 13 Oct 1997 15:49:48 +0000
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Subject: Re: Is this a bug ??? or feature ??
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Guan Foo Wah <djgpp AT rocketmail DOT com> wrote:

[Sniped code making not so good things] 
> 
> This is the output compiled on the DJGPP compiler (using BNU281B.ZIP)
> 
> Address : 155b 155b 155b
> Value before modifying : one one one
> Value after modifying  : fne fne fne
That's because they are CONSTANTS so the compiler suposse you'll never modify 
it. As you already got as reply you can change it.
These variables are normally in the code!
 
> and this is the output compiled on the TURBO C v3.0
> 
> Address : 00BC 00C0 00D7
> Value before modifying : one one one
> Value after modifying  : fne one one
Just because you don't turned on the optimize for size switchs ;-) There are 
one called merge strings or similar. 
 
>  >From the program output compiled on the DJGPP compiler, it seems that
> num[0], num[1] and id[2] share the same location memory. Why is this
> so ??
To avoid multiple copies of the same. You are declaring:

char *XXX=constant;

And I guess you want to make:

char XXX[nn]=__initializer__;

The first can be modified making:
XXX=another pointer
But not writing on it!

> When line 4 in the code which is "one" is replaced with "one ", the
> output
> will change to the one below.
> 
> Address : 155f 155b 155b
> Value before modifying : one  one one
> Value after modifying  : fne  one one
> 
> This time, num[1], and id[2] share the same memory location.
> Can anyone please tell me how to make those three variables not to
> share
> the same memory location ?? This is important in my project which I am
> currently working on.
Use arrays, that what you want, not pointers.

SET 
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