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[Frama-c-discuss] Problems with Nitrogen/Fluorine



Thanks for the response, but i have another question.
On my computer WP can't prove neither with Nitrogen version nor with
Fluorine version.
This could be due to my computer configuration in particular?
Kind regards,
   Alessio Iotti


2013/10/22 Alessio Iotti <alle.iot at gmail.com>

> Thank you for the response. I modified the program, i used the Jessie
> plugin instead of the WP plugin and it works.
>
> However "ACSL By Example" refers to Frama-C Nitrogen 20111001 used with
> the WP plugin, as i tried originally.
> Which can be the causes of this discrepancy between my version (in
> attachment) and the one on the paper?
>
> Kind regards,
>
>     Alessio Iotti
>
>
> 2013/10/17 Guillaume Melquiond <guillaume.melquiond at inria.fr>
>
>> On 17/10/2013 10:13, Alessio Iotti wrote:
>>
>>> Dear All, i am moving the first steps with Frama-C, following the
>>> excellent tutorial "ACSL By Example".
>>> I have encountered a problem trying to replicate the count algorithm
>>> experiment. The attached file,
>>> taken literally from "ACSL By Example", illustrates the problem in
>>> comments beginning with "/***".
>>>
>>
>> That is somehow fortunate that Fluorine fails at proving it, and that is
>> kind of scary that Nitrogen (even partly) succeeded, because what you are
>> trying to prove is plain wrong!
>>
>> Axiom count2 should have been written
>>
>> \forall int *a, v, integer i ;
>>   (a[i] != v ==> Count(a, v, i, i+1) == 0) &&
>>   (a[i] == v ==> Count(a, v, i, i+1) == 1);
>>
>> Once changed, all the proof obligations are verified.
>>
>> Best regards,
>>
>> Guillaume
>>
>
>
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