Re: Integer Overflow Question.

[austin.obyrne769@btinternet.com]

On Monday, August 25, 2014 6:21:43 PM UTC+1, Simon Wright wrote:
> austin.obyrne769@btinternet.com writes:
> 
> 
> 
> > Could you please set out the Ada-95 sourcecode for defining an integer
> 
> > variable called "CipherText" in the range say of 8 decimal digits to
> 
> > 12 decimal digits. I can do the others myself once I know what to do.
> 
> 
> 
> This may help:
> 
> 
> 
> with Ada.Text_IO;
> 
> procedure Obyrne is
> 
>    type Ciphertext_Integer is range -10 ** 12 .. 10 ** 12;
> 
> begin
> 
>    Ada.Text_IO.Put_Line
> 
>      ("first is " & Ciphertext_Integer'Image (Ciphertext_Integer'First)
> 
>         & ", last is " & Ciphertext_Integer'Image (Ciphertext_Integer'Last));
> 
> end Obyrne;
> 
> 
> 
> With up-to-date GNAT, this outputs
> 
> 
> 
> first is -1000000000000, last is  1000000000000

One last question that may have been taken for granted by the various people who helped me re-define integers.

If I define integers in a range that is outside of 2^31 - 1 (2147483647) will it be possible to use these in a 32-bit computer or is the advice and methodology re user defined integers given to me earlier related to 64-bit environment only - I forgot to ask.  This is important because I must cater for both sizes of home owners' computers.

If defining integers larger than the scope of the 32-bit computer means using 64-bit as an inevitable consequence then I cannot do it.

Would some body comment on this please.

Sorry to be such a nuisance.


adacrypt