John von Neumann, probably.
What language should one use for floating point calculations?
TCL, of course, because EIAS!
In most languages there are libraries to deal with precise numbers. For example, you can use Decimal in Python. https://docs.python.org/3/library/decimal.html
But it may not be as fast or have other inconveniences (for example, defining explicitly the precision)
There are some good examples in the list @HugoDaniel posted in this thread.
Here’s something interesting for JS: http://mikemcl.github.io/decimal.js/
If you want it to work correctly, then probably SPARK, C w/ tooling, or Gappa w/ language of your choosing. If performance isn’t an issue, there’s a pile of languages with arbitrary-precision arithmetic plus libraries for those without it. I’d say that’s the options.
Meanwhile, there’s work in formal methods on Exact-Real Arithmetic that could give us new options later. There was an uptick in it in 2018. I’m keeping an distant eye on it.
The module sh is a fantastic tool for these kind of scripts. https://github.com/amoffat/sh