Math expressions with project attached

[Dreyfuss Pierre-André (EDU)]

 Sorry I forget to attach the project.


-----Message d'origine-----
De: Dreyfuss Pierre-Andr? (EDU)
A: 'squeakland at squeakland.org'
Date: 22.04.03 16:47

Hi everybody,

I have made a project for teaching math expressions 
It is like a super spreadsheet, You can build any expression and see the
result for any part and of course for the expression itself.

Using watchers for the variables: expr (the expression )and res (the
expression with the result )you can see the corresponding math notation.
(Just extra parenthesis are not removed.).

The expression is built using Holders. Each holder must have three items
left part, operator, right part. In the operators, you have the result
of
the operation.

Left and right parts can be either a number or an expression.

That's all play with it .

Some scripts are written in smallTalk since two primitives are missing 
 as tiles:

1.- The number of objects in a holder:  self costume submorphs size

2.- The , to concatenate strings.

Best Regards

P-A Dreyfuss.
  

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