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Wow, didn't really expect you to read this far down. The latest iteration of the site is in open beta. It's a gentle open beta-- not in prime-time just yet. It's being hosted over at UpGuard (link) and you are more than welcome to give it a shot. Couple things:
This opens a python command line. You can use math and random and float-division is enabled (without appending .0 to integers). I just don't know how to specify a standard precision.
There are 3 alternatives - vote for the best!
works with fractions like 1/3.5
use python as calculator, press ctrl+d to exit
reminder: when doing factions add atleast one decimal number like so
22.0/7 or 22/7.0
This is an "argument calculator" funktion. The precision is set to 4 and you can use dot (.) or comma (,) as decimal mark (which is great for german users with a comma on the numpad).
If you can do better, submit your command here.
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