# [plt-scheme] cutting out of Interactions window

At Wed, 26 Oct 2005 11:20:30 -0400, Prabhakar Ragde wrote:
>* Matthias Felleisen wrote:
*>*
*>* >> There is a textual representation of the number right there in the
*>* >> Interactions window. I can see why images become snips, but not
*>* >> why this has to happen for numbers. Is there a purpose to a number
*>* >> snip cut out of the Interactions window? What would one do with it
*>* >> that would work, unlike pasting it into the Definitions window?
*>* >> --PR
*>* >
*>* > Fractions. They are snips. -- Matthias
*>*
*>* Yes, and you can tell, as with images, because they don't look like
*>* normal text in the Interactions window. (Though I don't see the harm in
*>* cutting a fraction and having it pasted as 5/6 instead of 5 atop 6 with
*>* a horizontal bar beneath.) You can't tell that a computed number is a
*>* snip, except by the colour, which is pretty subtle.
*
We used a snip rather than a textual representation to balance the
demands of showing the students numbers in the familiar decimal
notation, while not losing precision. You can see this with numbers
like 1/3, but perhaps a more interesting case is numbers like
(+ 1/3 (/ 1 (* 3 (expt 10 100)))) or even worse 779625/32258
Also, if you copy and paste that snip into a non-drscheme place, you do
get some textual approximation.
Robby