[plt-scheme] HTDP Exercises and language levels

At Wed, 19 Nov 2003 08:08:27 -0800, "Bradd W. Szonye" wrote:
>   For list-related administrative tasks:
>   http://list.cs.brown.edu/mailman/listinfo/plt-scheme
> 
> Matthias Felleisen wrote:
> > (draw-solid-disk (make-posn 10 10) 20 'red)
> > produces true.
> > 
> > (draw-solid-disk (make-posn 50 50) 40 'green)
> > produces true.
> > 
> > You want the first and the second expression to evaluate to true.
> > How can you force this to be the case?
> > 
> > Apologies for abusing and, but it offered itself. -- Matthias
> > 
> > P.S. I won't read any flames about the use of and for this purpose.
> 
> I don't see it as abusive. It's a fairly common idiom in any language
> that uses sequenced AND with status-returning functions (including C and
> Perl).

<not-flame>

Oh yes, but the abuse is that these functions aren't status returning
-- they return true!

:)

</not-flame>

Robby