User's Guide
After you define the application, the next step is to define a class within
the application STCalculatorApp. This new class will contain
the Smalltalk code to implement the calculator. You can create this
class from the Applications Browser:
- Select (Object) in the classes pane.
- From the Classes menu, select Add
> Subclass.
- Type STCalculator. As before, you might have to rename
the class if STCalculator already exists.
The following window appears:

- Select subclass and select OK.
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