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NNTP-Posting-Date: Sun, 16 Jan 2011 07:47:11 -0600
Date: Sun, 16 Jan 2011 08:47:10 -0500
From: "Peter C. Chapin" <PChapin@vtc.vsc.edu>
Organization: Vermont Technical College
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Subject: Re: Question about round__ proof function in SPARK proofs.
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Date: 2011-01-16T08:47:10-05:00
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On 2011-01-15 13:11, Phil Thornley wrote:

> You're quite correct about the round__ function - and the only way to
> discharge the VC is to supply user rules that state properties of the
> function.
> 
> An obvious form for the rule is:
> 
> round(1): round__(X) <= Y
>             may_be_deduced from
>         [ X <= Y,
>           goal(checktype(Y, integer)) ] .
> 
> and similarly for the lower bound.

Thanks so much for your suggestions. I'll try it out at my first
opportunity. If I run into any other problems I'll be sure to post here
again :)

Peter