FileSystemHashMapNotepadCalculator calculation engine works by loading Windows Calculator (how else could one guarantee a correct calculation?), copying the answer to the Clipboard, loading notepad, pasting it into notepad, saving a file to the folder with the appropriate Hash Key (C:\1.0000-ADD-2.0000 in this case), and then reading the resulting file to display the answer. It couldn’t be simpler!

very unixy approach

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