Re: gawk bug - 'is equal' is faulty for string

[Jérôme Jargot]

Haaa, of course!

Thank you for your answers

On Mon, Jan 27, 2020 at 3:42 PM Andrew J. Schorr <
address@hidden> wrote:

> On Mon, Jan 27, 2020 at 03:32:19PM +0100, Manuel Collado wrote:
> > I think this is the expected result in both cases. The
> > "$4==cversion" comparison is a numeric one, because both $4 and
> > cversion values come from input data and look as numbers.
> >
> > Please search for "numeric string" or "strnum" in the gawk manual.
>
> Manuel is correct. You can force a string comparison by concatenating one
> of
> the operands with "", e.g. (y == x"").  The chart below from the
> docs is useful for understanding how comparison works. And in newer
> versions of gawk, the typeof function is useful for getting a better
> understanding of what's going on.
>
> https://www.gnu.org/software/gawk/manual/html_node/Variable-Typing.html
>
>    When two operands are compared, either string comparison or numeric
> comparison may be used.  This depends upon the attributes of the
> operands, according to the following symmetric matrix:
>
>         +----------------------------------------------
>         |       STRING          NUMERIC         STRNUM
> --------+----------------------------------------------
>         |
> STRING  |       string          string          string
>         |
> NUMERIC |       string          numeric         numeric
>         |
> STRNUM  |       string          numeric         numeric
> --------+----------------------------------------------
>
> Regards,
> Andy
>