"Davide" <ppp@ppp.it> a �crit dans le message de news:c29c7h$hbq$1@e3k.asi.ansaldo.it...
> 1) always declare that variable as the *smallest* data type that will hold
> the highest value of its possible range (example: if it can assume values
> from 0 to 150 then declare it as an 8-bit integer);
>
Note the following very useful feature, if you want a type that includes *at least* a certain range:
   type Required is range 0..150;
   subtype Extended is Required'Base;

Extended will provide you with the underlying base type, which should be the minimal hardware efficient type that includes your
requirements.

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           J-P. Rosen (rosen@adalog.fr)
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