[Cuis-dev] basic question about methods

[Mark Volkmann]

Just getting started with Smalltalk ...

I defined the class VRectangle as follows:

Object subclass: #VRectangle
    instanceVariableNames: 'height width'
    classVariableNames: ''
    poolDictionaries: ''
    category: 'Playground'

Then I added the class method height:width: like this:

height: aHeight width: aWidth
    | r |
    r := self basicNew.
    r height: aHeight.
    r width: aWidth

Then I added these instance methods:

height: aNumber
    height := aNumber

width: aNumber
    width := aNumber

area
    ^ height * width

Then in a Workspace I did this:

r := VRectangle height: 2 width: 3.
r area.

I get MessageNotUnderstood from the last line, but I don't understand why.
I can inspect r and it looks good.

-- 
R. Mark Volkmann
Object Computing, Inc.
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