Re: Integer Overflow Question.

[Simon Clubley <clubley@remove_me.eisner.decus.org-Earth.UFP>]

On 2014-08-25, austin.obyrne769@btinternet.com <austin.obyrne769@btinternet.com> wrote:
> On Monday, August 25, 2014 12:46:01 PM UTC+1, G.B. wrote:
>> On 25.08.14 13:21, austin.obyrne769@btinternet.com wrote:
>> 
>> > I have had to put a bound on the maximum integer size output of computations at 2^31  which of course is the maximum positive integer that 32-bit computers can handle.
>> 
>> 
>> 
>> Would this not be 2^31 - 1?
>> 
>> 
>> 
>> Also, how does your program respond when translated with -gnato?
>
>>Would this not be 2^31 - 1? - NO
>
> The max, POS integer is 2^(32-1)
>

Signed or unsigned integers ?

> I understand the the max NEG integer is -[2^32-1)+1]
>

I think you understand incorrectly. The sign bit is a part of the
32 bit value so the range you can express is cut approx in half.

Simon.

-- 
Simon Clubley, clubley@remove_me.eisner.decus.org-Earth.UFP
Microsoft: Bringing you 1980s technology to a 21st century world