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I've mentioned this on SN before.

Back in ancient times long past, there were these things called "flip phones" or "candy bar phones". (Paleontologists label this as the "pre smart phone era")

https://soylentnews.org/comments.pl?cid=1134316&sid=42871 [soylentnews.org]

I remember J2ME. (Java "lite" on all of the billions of mobile phones in the pre smartphone daze.)

It didn't have any floating point. I was building my own "asteroids" clone. (And did successfully build it. Gave it to a few friends. Once that accomplishment achieved, I moved on.)

I needed trig functions. I wanted to draw the ship and rocks as sprites sub classed from a common super class. Each line vector figure (ship or rock) had a series of points relative to a "center" point. It was the center point of the sprite that moved on each frame update. In my game, the rocks rotated, unlike original asteroids. These points around the center point were expressed in polar (r-theta) form. Just draw a line from the first point to the last, and then back to the first, thus drawing a closed figure. (Ship or rock)

I need to convert from polar form to x-y coords, and then offset to the x-y center of the sprite before drawing on screen.

But J2ME only had long integers and no trig functions (or log, power, etc)

There was some library that had the name "bear" in it. This used a 64-bit long, dividing it into 32-bit mantissa and fraction. Trig functions did a few taylor series terms, and that was more than good enough.

Wow, those were ye olden daze. And it was after the year 2000. Wow, I'm getting old.

Be sure to see some replies after that posting.

See also:
https://soylentnews.org/comments.pl?noupdate=1&sid=40718&page=1&cid=1080994#commentwrap [soylentnews.org]
about drawing vector graphics on a scope, which in subsequent replies brings up the J2ME asteroids game again. It also shows a way to write a Factorial function without iteration. And how to do Trig functions when you have only integers but no floating point.