Re: [bug-gawk] Bug? - print int(100*32.98)

[Andrew J. Schorr]

On Mon, Jun 03, 2019 at 07:09:09AM -0600, address@hidden wrote:
> Hi.
> 
> Thanks for your note.
> 
> Robert Brandtner <address@hidden> wrote:
> 
> > Hello,
> >
> > Is the following result a bug or a feature?
> >
> > gawk 'BEGIN{print int(100*32.98)}'
> > => 3297
> >
> > Kind regards
> > Robert Brandtner
> 
> It's just the way things are. Gawk uses floating point math. 100 * 32.98
> isn't quite 3298:
> 
> $ gawk 'BEGIN{printf("%.17g\n", 100*32.98)}'
> 3297.9999999999995
> 
> When that result is handed to int(), it gets rounded down to 3297.

You could also consider using MPFR arithmetic with a higher precision.
For example:

bash-4.2$ gawk -M -v PREC=60 'BEGIN{print int(100*32.98)}'
3298

Regards,
Andy