The calculator is written using the most simplest XPCE interface and is based on the IUPFlib.
After installation, Erlang B Calculator will show a popup window of calculator.

There are 2 use cases:
1) Non-interactive calculator use-case. ie.
- when the calculator works.
- there is no switching between calculator programs.
2) Interactive calculator - ie.
- there is no calculator.
- when you press the calculate button 66cf4387b8 cailnair
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