Hello,
I want to integrate the windows calculator into my program (or any other good calculator if you know a nicer one ), but I need to proceed with the result, so I need a way to store it somehow (doesn't matter wheter I store it in a File, autocopy it, etc.).

So my questions are:

-How do I call the win calculator?
-How do I store the results?
-Are there any better ways of integrating a good calculator apart from writing one myself?

Thanks,
Lukas