Re: Integer Overflow Question.

[austin.obyrne769@btinternet.com]

On Monday, August 25, 2014 2:09:35 PM UTC+1, Simon Clubley wrote:
> 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

Thanks - I usually remember it in denary as,

Max Pos. Int = 2147483647
Max Neg. Int = -2147483648

The important thing to me is in knowing what to put in my exception handler.

Many thanks - Austin