How to round up the light year

[sergeevabc]

Dear fellows,
can you tell me how to express the light year shorter?

Right now there is

$ kalker 9460730472581
9 460 730 472 581 ≈ 9.4607304726×10^12

What I'm looking for is 9.46×10^12 or 9.46e12.

[PaddiM8]

9.46×10^12 should work, no?

[sergeevabc]

Sorry, what file should I create in this path %appdata%/kalker/ you mentioned?
Now I have nothing there, or rather, there is history.txt and that’s it.

Perhaps you mean there should be some configuration file created after installation, but you see, I'm not installing Kalker via MSI, After downloading MSI, I extract Kalker using Lessmsi by @activescott and put it in a folder with other portable apps (let's say C:\APPS\PORTABLE) added to PATH variable.

[PaddiM8]

Oops, sorry, forgot to mention the file name. %appdata%/kalker/default.kalker is the file. history.txt being there is a good sign.

[sergeevabc]

$ type default.kalker
truncate(x, n) = floor(x * 10^n) / 10^n

$ kalker truncate(9460730472581, 2)
9 460 730 472 581 ≈ 9.4607304726×10^12

whereas 9.46×10^12 is expected.

[PaddiM8]

Ah well for integers it would be truncate(x, n) = floor(x / 10^(floor(log(x)) - n)) * 10^floor(log(x) - n) I think. A bit more complicated, but 10^(floor(log(x)) - n) could be its own function to make it more readable.

[sergeevabc]

Congratulations, @PaddiM8, we did it.
By the way, Qalc comes from Sweden as well, @hanna-kn is especially helpful.

[PaddiM8]

Ohh nice, that was fun. Didn't know that about Qalc, neat.