Re: [Groff] Combining logical operators and conditions

[Ralph Graulich]

> This doesn't work.  groff.info says about 'XXX'YYY' and other
> operators:
> 
>   Note that these operators can't be combined with other operators
>   like `:' or `&'; only a leading `!' (without whitespace between the
>   exclamation mark and the operator) can be used to negate the
>   result.

Oh, well... I read that paragraph at the end of the operator's section, but I 
failed to connect this information to the whole list of operators. Now that I 
reread it, it's clear why it doesn't work the way I expected it to work.

[...]
>> That works as expected, but there has to be an obvious and easy
>> solution without the additional number register.
> 
> Not that I'm aware of.  Note, however, if you have a lot of such
> comparisons, you could do the following:
> 
>  .ds str1 bar
>  .
>  .nr nr1 5
>  .ds str1-foo \"
>  .ds str1-bar \"
>  .ds str1-baz \"
>  .
>  .if d str1-\*[str1] \
>  .  if (\n[nr1] == 5 ) \
>  .    tm okay

Interesting solution, indeed! -
It didn't solve my problem though, because I just posted an oversimplified 
version of it to explain the general problem I had - although with the help of 
your solution I was able to finally solve my problem, too.

Thank you very much for your help!

A question regarding to coding style: Which is considered the "better" way to 
compare numbers, using "=" or "=="?

Best regards
Ralph