* differences between C and Ada
@ 1999-07-22 0:00 aurelien_ratti
1999-07-22 0:00 ` Ted Dennison
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: aurelien_ratti @ 1999-07-22 0:00 UTC (permalink / raw)
Hello.
What is the difference between C's static variables and Ada's global
variables ?
Thank you for your help.
Aurelien
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* Re: differences between C and Ada
1999-07-22 0:00 differences between C and Ada aurelien_ratti
1999-07-22 0:00 ` Ted Dennison
1999-07-22 0:00 ` Martin Gangkofer
@ 1999-07-22 0:00 ` czgrr
1999-07-22 0:00 ` Steve Folly
2 siblings, 1 reply; 6+ messages in thread
From: czgrr @ 1999-07-22 0:00 UTC (permalink / raw)
In article <7n6ioe$lkd$1@nnrp1.deja.com>,
aurelien_ratti@my-deja.com wrote:
> Hello.
Hello.
> What is the difference between C's static variables and Ada's global
> variables ?
One difference is that Ada's global variables have to be, er, global.
That means anything in the package that declares them can access them.
In C++ (and, I assume, C), a static variable can be declared at local
scope, but still has the lifetime of a global.
Another difference is that the C++ compiler will automatically
initialise a static variable to 0 before it is first used. In Ada, you
still have to explicitly initialise it.
A third difference (possibly, I haven't tried it) is that if you have a
C++ class with a static variable, there is only one instance of the
variable regardless of how many objects there are of that class, even
if there are none. In Ada (I think), a global variable in a generic
package exists once per instantiation. Don't know if or how this
translates to C.
I'm sure there's more.
Cheers,
czgrr
--
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Assume Ada83 and (V)C++ unless said otherwise.
My opinions are independent from my employer's.
Use any suggestions at your own risk.
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* Re: differences between C and Ada
1999-07-22 0:00 differences between C and Ada aurelien_ratti
1999-07-22 0:00 ` Ted Dennison
@ 1999-07-22 0:00 ` Martin Gangkofer
1999-07-22 0:00 ` czgrr
2 siblings, 0 replies; 6+ messages in thread
From: Martin Gangkofer @ 1999-07-22 0:00 UTC (permalink / raw)
In article <7n6ioe$lkd$1@nnrp1.deja.com>,
aurelien_ratti@my-deja.com wrote:
> Hello.
>
> What is the difference between C's static variables and Ada's global
> variables ?
>
> Thank you for your help.
>
> Aurelien
>
> Sent via Deja.com http://www.deja.com/
> Share what you know. Learn what you don't.
>
the only difference I have noticed is, that C static variables are
initialised not by assignment because C does not know something like
elaboration, while ADA global variables may explicitly be initialised.
Martin.
--
Martin Gangkofer, System Engineer
ESG Elektroniksystem und -Logistik GmbH, Dept.EF-E
eMail: mgangkof@esg-gmbh.de
Tel: +49 89 9216 2176
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* Re: differences between C and Ada
1999-07-22 0:00 differences between C and Ada aurelien_ratti
@ 1999-07-22 0:00 ` Ted Dennison
1999-07-22 0:00 ` Martin Gangkofer
1999-07-22 0:00 ` czgrr
2 siblings, 0 replies; 6+ messages in thread
From: Ted Dennison @ 1999-07-22 0:00 UTC (permalink / raw)
In article <7n6ioe$lkd$1@nnrp1.deja.com>,
aurelien_ratti@my-deja.com wrote:
> Hello.
>
> What is the difference between C's static variables and Ada's global
> variables ?
"static" in C can mean several different things, depending on the
context. What type of "static" were you thinking of?
--
T.E.D.
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* Re: differences between C and Ada
1999-07-22 0:00 ` czgrr
@ 1999-07-22 0:00 ` Steve Folly
1999-07-26 0:00 ` aurelien_ratti
0 siblings, 1 reply; 6+ messages in thread
From: Steve Folly @ 1999-07-22 0:00 UTC (permalink / raw)
czgrr <czgrr@my-deja.com> wrote in message
news:7n718n$pet$1@nnrp1.deja.com...
> In article <7n6ioe$lkd$1@nnrp1.deja.com>,
> aurelien_ratti@my-deja.com wrote:
> > Hello.
>
> Hello.
>
>
> > What is the difference between C's static variables and Ada's global
> > variables ?
>
<snipped good answer>
Has that answered your homework question, Aurelien?
--
Regards,
Steve Folly - Y2K compliant since 32nd Februark 1998
http://www.follysplace.demon.co.uk
donationsto:myaccount@mybank.co.uk
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: differences between C and Ada
1999-07-22 0:00 ` Steve Folly
@ 1999-07-26 0:00 ` aurelien_ratti
0 siblings, 0 replies; 6+ messages in thread
From: aurelien_ratti @ 1999-07-26 0:00 UTC (permalink / raw)
> > > What is the difference between C's static variables and Ada's
global
> > > variables ?
> >
>
> <snipped good answer>
>
> Has that answered your homework question, Aurelien ?
>
Yes, it seems to be quite complete ! But if you know other differences,
I'm still interested in.
Thank you for your answers.
Aurelien
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1999-07-22 0:00 differences between C and Ada aurelien_ratti
1999-07-22 0:00 ` Ted Dennison
1999-07-22 0:00 ` Martin Gangkofer
1999-07-22 0:00 ` czgrr
1999-07-22 0:00 ` Steve Folly
1999-07-26 0:00 ` aurelien_ratti
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