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From: "vic" <ppp@ppp.it>
Newsgroups: comp.lang.ada
Subject: The right way to handle this difference in Ada
Date: Thu, 22 Jul 2004 12:23:09 +0200
Organization: Finmeccanica
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Date: 2004-07-22T12:23:09+02:00
List-Id: <comp.lang.ada>

Hello,

I'm starting to develope in Ada 95, but as I come from C++ language I'm
having some difficulties about strong typing.


Please consider this type:

type unsigned_int_12_type is range 0..(2*12)-1;

and these 2 variables of the above type:

a: unsigned_int_12_type;
b: unsigned_int_12_type;

If the code must perform a difference between a and b, say:

c := a-b

1) which should be the type of c? I think it should be something like:

type signed_int_12_type is range -unsigned_int_12'last ..
unsigned_int_12'last.

Is this right?

2) And I should rename a "-" operation which gets two signed_int_12_type  as
operands and returns signed_int_12_type as result?


Thanks,

vic