Calculating π the hard way
In honor of Pi Day, I was going to try to write a script that computed π in shell, but given the lack of floating point support, I decided it would be too messy. If you want to see hard to follow code to generate π, I highly recommend the IOCCC entry westley.c from 1998, the majority of which is an ASCII art circle which calculates its own area and radius in order to estimate π. The hint file suggests looking at the output of
$ cc -E westley.c
The 2012 entry, endoh2 is also a pretty amazing π calculator.
Instead, I will just generate π the shell way: using another program.
$ python -c 'import math; print(math.pi)' 3.14159265359