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Re: Bash arithmetic doesn't give error message on wrap.


From: Paul Jarc
Subject: Re: Bash arithmetic doesn't give error message on wrap.
Date: Mon, 30 Apr 2007 16:36:50 -0400
User-agent: Gnus/5.110003 (No Gnus v0.3) Emacs/21.4 (gnu/linux)

Richard Neill <address@hidden> wrote:
> I thought testing for overflow was quite simple?
> Isn't it just a case of looking at the carry-bit, and seeing whether it 
> gets set?

That's usually how it's done in assembly.  In C, it's somewhat more
compilcated.  For example:
result=a*b;
if (result/a!=b) { report overflow; }


paul




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