[plt-scheme] cutting out of Interactions window

From: Matthias Felleisen (matthias at ccs.neu.edu)
Date: Wed Oct 26 10:54:16 EDT 2005

On Oct 26, 2005, at 10:13 AM, Prabhakar Ragde wrote:

> Robby Findler wrote:
>> Only if the snips have no textual representation does this change
>> happen. Probably they copied either image snips or number snips. (Does
>> that sound right?)
> They're number snips. What they're doing, which I don't condone in the 
> least, is writing their examples after they get their code running, 
> and pasting the "expected" answers which they've already computed into 
> the comments preceding their function. So in some sense they've shot 
> themselves in the feet.

Great. Perhaps we should leave this bug in drscheme for this purpose :-)

I strongly recommend adding problems on homeworks and tests where the 
students construct examples/tests _only_.

Even better, assign problems after the midterm that can't be solved 
without developing an intuition into the data definitions via examples 
first. The interpreter comes to mind; today I dealt with XML 
representations in an iterative refinement fashion.

> Eli kindly provided wxme-to-text, which we can run, but I'm just 
> trying to understand why this should happen.
> 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

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