Re: [WWdevel] spaces and units in answers

[John J. <jj...@as...>]

Davide P. Cervone wrote:

>>In testing an answer, "3 ft / s" worked for me, but "3ft / s" gave  
>>a pink screen.
>>    
>>
>
>Sorry about that.  I have fixed it, and now use a more sophisticated  
>approach to strip off the units that will find them even when there  
>is no leading space.  But since the %Units::known_units hash is  
>private, the pattern is a little more aggressive than it ideally  
>would be.  This shouldn't be a problem for well-formatted answers,  
>but some erroneous answers may get unhelpful messages.  For example  
>entering "3x" would give an error about unknown unit 'x'.  The regexp  
>approach is never going to be perfect, but the better approach would  
>be to make a proper units class for the Parser.
>
Thanks.  The current version works great.

If a student enters 3x to a question which is asking for a number with a 
unit, then "Unrecognizable unit: |x|" is a reasonable diagnostic message 
to give students.  I imagine it could be improved, but it is definitely 
much better than it was before.

John